Perhaps you should spend a bit of time doing the Maruppe daily map for levels.

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Originally Posted by maotd

What's your girls/ally level? I'm just enough powerful to clear stage2 with 1 crystal revive.
Currently I just have 75 eggs and I'm still trying to level up to beat the 1st stage.

are you afking it or fighting the boss manually? cuz fighting boss manually makes it much easier. My girls are lv 16 now but they've been doing this since like lv 12.

The difficulty doesn't increase that much (until like stage 10). In fact, stage 7 is easier than some of the earlier stages IMO. Just use some crystals (if you dont care about xovred) to blast thru to stage 7. I can get through it like 90% of the time without using an extra crystal.