What are we doing to calm these kids down?

I am raising a 4 year old (5 in August) boy. He is receiving autism assistance in school but no official diagnosis which is my current decision. I always willing to change if I see he needs more. My son passed his Kindergarten readiness test in Pre-K as far as what he understands and identifies, he potty trained (partially, he poops in a pull up), he dressed himself, cleans up his room and so much more.

My son has WAY TOO MUCH ENERGY at times. I’m trying to go the vitamin route first before I medicate him ( my last resort). In my opinion he would be so much farther ahead than where he is, if he could focus longer than 15 minutes.

I’m looking for suggestions, anything is better than nothing.