I suggest becoming informed and read about other economic systems yourself. There is a bit of ad hominem in your question. For many the materialist concerns of the current dominant economic system is why people complain. Those complaining aren’t the cause and should not be rebuked. The rich are getting richer and the poor; poorer. The chasm between the two only grows wider.

That said, many folks on the political spectrum would at least like to see the US end of neoliberal capitalism and a return to Kantian/welfare economic capitalism. You see flavors of this in European Democratic socialist countries, albeit even those are succumbing to neoliberalisation.

If you get into rights based discussion, many in that spectrum and further left would like to see positive rights enshirined constitutionally as well as the ERA. This would bring about many of those kantian economic mechanisms by default.

For many more on the left, we literally want to seize the means of production and distribute wealth equally among the masses. Bring about socialism to progress to communism. The DSA believes in a change and revolution from within, and have a national platform and a growing base. There are also the PSL, which demands a more revolutionary overthrow of capitalism into communism. Briefly put.

Tax the rich, regulate industry, punish CEOs and boards for crimes committed by corporations.

You’re coming off fairly condescending. Leftists of many stripes not only have thorough critiques of Capitalism, but offer a wide range of solutions, both legislative and grass-roots.

There may be a lot of ranting, but most of it is based within robust theory and legislative efforts.

Strengthening unions and workers rights laws is almost always advocated for. Weakening the ability for corporations to exploit their workers and the general population/environment is another.

I’m an Agorist, that means I advocate fighting Capitalism from the ground up using grey and black markets to subvert existing Capitalist structures.

So acquiring and distributing pirated materials like college textbooks and otherwise expensive software is one example. Helping people jailbreak/hack their devices to run unofficial software that the corporations don’t approve of is another.

There’s lots of information out there, don’t mistake memes and ranting for empty idealism.

The youtube channel, Economics Explained, has a lot of great videos on macroeconomic concepts. They recently featured a video on Norway pointing out how it handles its economy near perfectly.

The video explains Norway got pretty lucky, and it’s not like every country could straight up copy them and succeed, but the major points are:

1. Their massive natural resource reserves are majority owned by the government. The government puts the profits from this into stable long term investments to benfit the citizens of the country. In many other countries, natural resources have been sold to private companies for a one time payment and private shareholders now benefit from the long term investment.
2. Their government has one of the highest tax rates in the world, even though they earn so much profit from natural resources they could literally have a 0% tax rate. Despite this massive tax rate, Norway has some of the lowest emigration of people and companies. Nobody has fled the country due to high taxes like many fear would happen elsewhere.
3. Their government spends heavily on social welfare and ensuring a high quality of life for all of its citizens, and their companies provide short work weeks and long vacations, which are huge reasons why nobody has left.

I think when people say they hate capitalism, what they mean is they hate working 50 hour weeks at a job they hate for a boss who treats them like dirt for a salary that doesn’t even pay their rent while the CEO has more wealth than small nations and spends it on eating endangered animals on their mega yatch with politicians and judges who then pass laws making it legal to hire children and dump garbage into the ocean. They don’t really care about private companies and investments, they care about how sociopathic greed has become so normal that it’s actively defended.

Not an answer, but I do want to point out that your question may be missing a crucial point. Primarily: There are different types of capitalism. When people mock or complain about the current economy, you might hear about “late stage capitalism.” That’s because that’s referring to the current type of capitalism that we’re operating under. And Bernie Sanders believes in capitalism, too. But his belief is in a different type of capitalism.

This is all to say, when people complain, it may not even be that they want to replace capitalism, but even shifting to a more friendly type of capitalism would significantly remove a lot of strain from workers. I don’t mean to imply that that’s what the people you’re referring to meant, but I think it is important to consider that criticism against capitalism does not necessarily mean a full shift away from capitalism

Return to pre-Reagan tax codes and laws. Bring back the 90% tax rate.

I haven’t a lot useful to say among the comments that are already here but I will say most broadly:

Democracy in the work place. Corporations and industries are too big and affect too many people to be governed by individuals that are just there to own it, and make a profit for themselves. Things need to be run for the common good by actually representing all stakeholders fairly.

Incentives for worker ownership of companies to move more major economic decisions into the hands of workers. Mandatory worker representation on boards of directors. Significant wealth and inheritance tax. A nationalized healthcare service. Public ownership of all utilities, including internet service. Bring back programs like the WPA and CCC to rebuild infrastructure. Entirely publicly funded elections. Overturn Taft-Hartley, overturn all “right to work” laws natonwide. I think all these things would help us transition to a more just, inclusive economy. That’s what democratic socialism is to me, and it’s not just social democracy.

I support any policy that increases competition or against policies that remove competition. Public companies need great justification to merge. The vast majority of the food we buy is run by like 4 companies.

A specific pay-rate ratio between shareholders and all employees. Executives and shareholders should not be getting paid 100x what the bottom employees get paid. This kind of inequality is what is bringing about the collapse. As company profits increase, all employees should get the benefits, not just the execs and shareholders.

there is such a variation from what I see. Some anti capitalist are just anti corporatist while others would throw out the whole idea of buying/selling.

Keep the present system but add way more rules.

EPI.org has a lot of solutions I support.

I guess one specific, concrete example would be reversing Citizens United. As I understand it, that could be done either by legislative action or through the judicial, though the former would probably be better.

Health insurance through work.

Somehow health, vision, and dental insurance are a fixed price. The highest earners pay the exact same as the lowest. However, retirement savings through work are based on a percentage of income. Both of these things benefit higher earners the most