UserStyles Link: https://userstyles.world/style/10309/densify-for-lemmy
Not sure if this is the right community, but the narrowness of the default web page was driving me a little crazy. I still need to fix a few things (like vertically centering the votes) but I feel that this looks a lot better. If you have the Stylus browser add on, you should be able to add it pretty simply!
Have you considered asking the Lemmy devs if they like this? I find it quite the improvement, maybe you can upstream these changes so every server can enjoy them!