To quote Thom Yorke, "You do it to yourself, you do; and that's why it really hurts"
In many cases, you can probably get by with your browser's default Reader Mode.
I'll use uBlock Origin's element zapper on a whole heck of a lot of sites, and you can write default rules for common annoyances as well.
If you get fancy, you can write generalised styles which address specific annoyances, and toggle those on or off on specific websites.
Otherwise, I'd found I'd written a thousand or so custom styles over a couple of years at one point. Most were quite elementary (usually font tweaks or removing headers / social link-litter). A few ... somewhat less elementary. Taught myself a lot about CSS in the process.