I feel like I’m doing everything “right” but I’m not gaining muscle. Tips?

I had a baby 15 months ago and I got serious about training 2 months ago. Before that, I lifted regularly but I wasn’t accurately tracking. I also started to take creatine 3 weeks ago. I’m losing weight (which isn’t my goal) since I started tracking but no luck on looking “fit.” My inbody says BF is 28%. I’m 103 lbs now. I eat 100-120g of protein a day. I do play tennis so maybe too much cardio? I’m not willing to not play 2x a week though. Any tips? Thoughts?