There’s great advice on here about showcases, etc. I will add that my 2018 and a HS teammate were both invited to a P5 college camp their sophomore year the same way—through HS coach. Went and received an evaluation in the mail with essentially a “don’t call us, well call you” note on it regarding recruiting.
Two years later, my son is throwing 90, same school invited him to another camp. He went, they offered that day and we just finished orientation. His teammate had the same experience. A lot of hard work on field and off, along with a lot of communication with the coach went on between the two