@kateetak Firstly, InBody scans are mostly crap--they're too variable to really give meaningful, actionable data in most cases.
So, going by what you look like, how your clothes fit, how you feel, what your goals are, etc.--What are you happy with and what are you not happy with?
i’m very happy with my lower body “gains”. i went from having no ass to having one, but my gains seem mainly driven by fat as opposed to muscle, even though i definitely have some glute muscles. i’m scared that if i lose weight, i’ll lose my lower body gains.
I mean, if what you gained in your butt was fat and you lose fat, then yes, it's likely your butt will get smaller.
That doesn't mean that you'll go back to looking like your 'before' photos either, though, as you've likely built muscle over the last year and as such if you want to cut at this point, you'll probably look different than you did a year ago.
If you're heavier than you want to be, you need to assess your diet and eat less. You can help keep the muscle you have by continuing to lift and keeping your protein intake up. 100g is probably close enough, though keeping protein high gets tougher when you calorie restrict.
What's your lifting program like? Who wrote it? What's the progression scheme?