Light modes
I would love to see a comfortable light mode for the website. I tend to work in brightly lit spaces and outdoors, and the usual dark modes make it very hard for my aging eyes to focus (that being said, I really like the gradation in the site's default dark mode).
Light modes can be difficult to get right (not too bright, good enough contrast, etc etc) but I think it would really pay off for those of us that need them. As a reference, mathstodon.xyz has a decent light mode, but I do find it a bit too bright personally.