Try uBO Lite, which is official and MV3. It is very much good enough, it’s just the edges and user-defined filters that aren’t covered. Adblocking possibilities in MV3 have improved a lot, though they obviously still aren’t par and could probably never be par with MV2
I’m pretty sure ABP also had user-defined filters… I strongly disagree that user defined filters out of all things that makes uBO better. It’s the dedicated filter team, the advanced filter syntax, the memory consumption, the uWall integration…