How else would you know what needs fixing?
Oh, well if you ever met my father he would've already told you, and he's not even a professional drummer/plumber/carpenter/lawyer/doctor ... etc. etc.
If you have met my father, ignore him and hire a professional drum instructor. Even if the idea of sitting with an instructor once a week or two weeks or whatever doesn't thrill you, just go once and talk. Have him assess your playing. The worst that could happen is you talk drums with someone who knows what they're talking about for 30+ minutes. I've paid much more for much less entertaining content.
