About to just become strictly f2p

I’ve spent a good amount on this game and I’m starting to get tired and bored. I know this is a gacha game but recently I have been rolling down to pity to get anything and then it frustrates me that I get a 5 star card that I can get in the monthly rotation.

Maybe my luck isn’t the best but is anyone else just sick of how you aren’t able to earn diamonds that much?