Good guidelines for taking rest days?

Am I overworking myself?

In short, (19 MtF, for what it matters. No hormones yet.) have been trying working specifically glutes, hips and thighs to an extent since late September. My usual schedule is 4-5 days of purely leg exercises every week, with Saturdays and Sundays always being rest days. Every thing I do is from my dorm room with bodyweight only, and I usually walk 3-4 miles daily on average.

In that time, I’ve definitely seen some progress with the upper area and sides of my bum, but since around ~week 2, a noticed an indent developing mostly in my left glute Maximus area, but I can feel it slightly on my right as well. Initially, i researched and found that it could be due to me not eating enough for the muscle to be developed, so I got a bit more liberal with my meals*. I think this has helped my thighs along a bit I can feel more muscle but not too sure about size overall since I was already on the chubby side and lucky to already have bigger thighs to begin with.

The bum indents are still there, though, which brings me to my question: should I be taking more rest days? I’ve read that overuse of a muscle can give your body less time to replenish, thus hurting progress, but I also don’t want to lose progress for no reason.