Is there anything I could change to increase my velocity? Btw I was using the towel so you could see my follow through.

I think just about everyone on this website will refrain from commenting on towel drill mechanics. It would be much more beneficial if you could put up a video of you pitching with game intensity from the mound with multiple views.

I wasn’t trying to do the towel drill, I was just holding the towel to try and make it easier to see my arm action. Sorry I couldn’t get to a mound but I was at home by myself.

You need to post video of your mechanics going all out, or at least a representation of what you do with a ball in hand. No one can give you a fair assessment with video of you just going through the motions.