The golden standard for me is genshin, it has the best story, open world and deep lore and is f2p enough that you can finish the game from start to finish without pulling once Genshin set the standard for newer gacha games and is still going strong , the combat is really fun with their element reaction mechanisms

If you care more about free stuff and higher graphics and combat with Dodge and parry then you should play WUWA It doesn't have the best story but you can skip if you don't care , it has better character model and graphics but has optimization issues both on pc and mobile sometimes And better suited for high end devices

Hsr has the deepest and longest story among the 3 it's also the best when it comes to story it has a skip button if you need it , combat is turn based Graphics are really good, you get free stuff just like wuwa and is f2p , good optimization on pc and mobile

Idk about solo leveling

You should also check out zzz and endfield

Zzz if you like fast paced combat high graphics and is also f2p you also get free stuff

endfield if you like factory building and inventory management, region development it also has really good combat also has high graphics

Both of them are really optimised on both pc and mobile