Good advice so far...I would add that, when smaller size is in the mix, it might be wise to find venues where a lengthier exposure is possible (target college 3-5 day camps, week long quality national tournaments)...this way the person scouting can see play after play, day after day if needed. In general, a smaller player is not going to make quite as big an impact in a two day showcase, where a few ground balls are fielded and a couple of rounds of bp are taken. One of these could be useful in getting the speed, etc. on the map.
Prior to WWBA 17u Nationals in Marietta (between jr/sr year), I would say my kid was barely on the radar as far as serious interest. He "only" had the local jc in his offer pocket. (He went to a top tier week long camp of one of his favorite D-1's a few weeks prior.) After a good, consistent production in the WWBA, he had interest from 6 D-1's...serious interest from 2-3 quality programs...and is now in his 2nd year at a good D-1.
Summary of my advice...pick 2 or 3 target programs and attend a summer camp or two there...get on a good team (after the soph and jr years) that competes in the quality national tournaments.
Lightning in a bottle does happen, especially after much hard work.