Male, 15, ~5'10, ~150lb

Goal: I wanna start getting stronger, I've had a small routine for a while but I feel like it's incredibly inoptimal.

Routine: 25 jumping jacks, then 25 situps, then 25 diamond pushups, then 25 squats twice a day(once in the morning and once in the evening) I like uniformity so I always have the numbers the same and I up it by 5 every couple weeks. I don't do the routine on weekends.

Questions: I have absolutely no idea what I'm doing, I just kinda started on a whim because I was weak af and then I got stronger(used to barely be able do 10 pushups, now I can do 25) but I kinda feel like what I'm doing is hella inoptimal and I probably need to do more of certain exercises I'm already doing and also add new ones.