It's fun..

Oh no, you must be really upset that you accidentally hit rebirth thinking it was a job change! Don't be too sad, because starting over means our kitties are just getting ready to become even stronger. I'll sweetly cheer you on as you gather gems again, hehe.

I think I can get stronger by repeating reincarnation multiple times. This is my first time playing this game, but reincarnation was essential in other games that had it, so I think it'll work here too.

Reincarnate and put all your points into the Attack stat below Reincarnation. Then you'll breeze through stages.

Ah, you fell into the 'Rebirth' button trap! You thought you'd get a cooler class change and become stronger, but starting over from level 1 can be really daunting. (I remember being totally freaked out after accidentally pressing it when I was a beginner too. 🥲) Still, it's a relief that you got decent rewards! In idle or RPG games, rebirth might feel empty at first, but after upgrading things like permanent buffs or relics with the rewards you received, it can become a stepping stone for explosive growth at a much faster pace than before.

It's a waste of time because if I reincarnate, I have to start over from the beginning.

Thanks to those who recommended reincarnation, I also think I finished Platinum Hidden without much difficulty by reincarnating... or was it? Wouldn't they have made it because it's good to do? haha

When you get stuck pushing through stages, you reincarnate and get points to invest in fixed stats. You use those points to become a little stronger. Since you're already stronger when you start over, you can breeze through the early stages quickly.