9anime.to is the best there is. Has an absolutely massive catalog of TV, OVA, and Movie releases. Streams are almost always very high quality. Idk about 4K support, but most shows are 1080p. Make sure you use a very good ad and pop-up blocker, the site is loaded with them. On mobile I use adblock browser and it works perfectly.
Piracy
Welcome to /c/piracy
No netflix or streaming services landlubbers allowed, this is pirates territory.
This is the one I was going to recommend. It's a good one.
I was using zoro.to for a while. I don’t know if it’s still working or not
animepahe.ru has a good selection at high qualities imo
theindex(dot)moe
Consider ddling through xdcc as an alternative to torrenting if you don't have a vpn. Quality will likely be better than you can find on any streaming site.
Zoro.to is my go to
Try Zoro dot to that's my go to for streaming
Before I could afford Crunchyroll I used animefreak.tv, which was just ok. Quality varried, website stability was questionable, and I remember once getting to the last ep of season 4 and the subs were randomly in vietnamese for just that episode. We watched the whole thing through google instant translate so we could understand what was happening.