Well there are a few things you can do to find your rhythm more often.
THROW STRIKE 1
The first component of finding your rhythm is strike 1. You’ve got to get ahead in the count. It’s hard to find a rhythm if your constantly behind and trying to battle back into an advantageous count. Make it a point before each new batter to focus on the idea of throwing strike 1.
The next piece of the puzzle is to work diligently. I don’t want you to think “fast”, but rather “faster’. Be intentional after each pitch-whether it was good or bad- to get the ball back from the catcher, toe the rubber, get your signal and go back to work. I see a lot of young pitchers take way too much time in between each pitch. They get the ball, rub it down, take off their cap and wipe their forehead, walk around behind the mound, or do a variety of other things-and then toe the rubber and start over.