Vinegar - $2 - Adblock for youtube, PiP, and enables background audio. In tandem with sponsorblock is absolutely stellar (in safari only, not the youtube app).
SponsorBlock - $3 - Removes sponsor segments from youtube videos (in safari only, not the youtube app).
Adguard - $12 maybe $6, their pricing is weird - Safari wide adblock. Also has a element picker that can remove headers, banners, etc to declutter, just like ublock origin on desktop.
TweaksforTwitter - $10? I think it got pulled down from the US app store. - De-shitifies Twitter.
StoptheMadness - $10 - So god damn much.
Hush - Free - Removes cookie banners and trackers.
Noir - $3 - Safari night mode for sites that don’t play along with system dark mode.
Rekt - $1 - Removes many “open in our app” banners and redirects amp links.
Sink for Reddit - Free - Removes reddit ads and ‘open in app’ banner.
Banish - $3 - Another option that removes many “open in our app” banners.
Userscripts - Free - Loads whatever custom 3rd party javascript of your choosing into sites.
A lot of these have redundant features, so something like StoptheMadness and Adguard might consolidate a lot of the others. I get that this looks like death by $3, but these are just what I’ve gathered over the years. I’d only recommend Adguard at a minimum, vinegar and sponsorblock if you don’t already have premium, and the others if they mean anything to you. Again these are all safari features so nothing that will change anything system wide or in other apps like youtube.
Vinegar is a safari extension that gives you premium’s features. I’m almost certain it can do at least 1080 if not higher.