F2P's and P2P's should I spend the diamonds?

Is it worth the 600 diamonds? There is some stuff I REALLY want from this gatcha and idk if it's worth it cuz I am an f2p. I spent 1200 diamonds on my alt acc and my luck was SO BAD. I mainly want some stuff from the 4 and 3 star set but I still need some more opinions 😭