I got 3 months out of Honkai Star Rail for free, was decent before the grind hit. Also the first two worlds are the peak of the game, it goes to shit once you hit the Chinese-themed world. But overall I wouldn't even bother, all Gacha are shit.

HSR is actually the best miHoYo game, but they kind of fucked it up story/writing wise when they introduced Luofu, even Penacony was shit so that's when everyone stopped playing. The only good part of Penacony was another hag addition.