I suggest doing g9-g11 if possible, some of the shadow missions bump up on difficulty based on your level (adv is pretty sadlife for me because I suck).
g3 isn't hard, only maybe the baol parts (which if you can get a pro, that won't be so painful).
Also, still continue to abuse 24 hour rebirths, level up exploration level but not base. Stock up on as much AP as you can here, you'll be needing a lot of it later.
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