Whats the best way to lose weight without also losing muscle

[dickcheese]

Hi, I’m 15 as of July. I play basketball in my driveway most days, but I haven’t been making much progress, only losing about 2 pounds a month. Any tips on what I should do? I’ve also been considering a calorie deficit since I just learned what that is, but I don’t want to because I’m still growing and don’t want to stunt my height. I could also consider using some supplements, but no peptides since I cannot buy any and have no where to store it.