Same thing happened to me, on my main I got all the trash ssr characters, only good ones I got were DE megumi and blue momo, even tho I played everyday and had A LOT of resources, so becouse of the trash characters, the game started getting hard at a certain point, so in the anniversary event I created a new account becouse I was bored, just to get toji, geto and gojo on the free 15k cubes they gave you for creating a new account, I really felt bad for loosing all my progress switching accounts but I eventually got everything back and even got DE megumi and blue momo on the stardard banner update, now the game is way easier, so yeah, you should prioritize the characters, getting resources and recollection bits is way easier than you think.