Brand, thing, behavior, method, advice, mantra, etc.
I swear by Blackwing pencils.
Also, the ‘two minute rule’, which has really improved my life: “if it takes two minutes or less to do, just do it now; if it takes longer, schedule it.” I’ve got untreated attention issues and it’s very easy for me to notice something needing done, and overlook or procrastinate it because it seems inconvenient in the moment. Having a totally painless rule that forces me to acknowledge that thing I should pick up, that trash bag I should change, etc, or, to at least put on my calendar anything I mustn’t forget in the long run has been great for me.
My very first smartphone was a hand me down iPhone 3G. I ended up modding the piss out of it with jailbreak stuff. Eventually used a friend’s Android phone, which I hadn’t really interacted with at that point and realized I had essentially turned my iPhone into an Android. My next phone was an Android and all of them have been since. If you’re the type of person who likes (and gets value out of) doing tweaking, you probably should just get an Android. Many of the things you listed are doable with apps downloaded straight from the Google Play store.
I’ve been keeping my eye on the Galaxy line of phones, my last Android phone was a rooted S6. The fact that nearly-every iPhone out there is the same (OS-wise) makes it that much more valuable to me vs switching, since most Androids have easy root capabilities/customization so it’s overlooked. Going out in public and watching confused eyes watch my phone because it looks & acts different from what they’re used to is the beauty and value of it, from my perspective. Not to mention the resale market for iPhones on a jailbreakable version.