My son was just starting to throw hard as a junior in high school and also had good academics. In Feb. of junior year, nothing was happening recruiting-wise. So, we asked him to make a list of about 40 schools he would consider for college AND baseball (outside of the obvious top 50 programs). Then he made a recruiting video at the local PBR facility (no music with essential stats and GPA on the first frame) and started emailing the recruiting coaches at those 40 schools. He also, as @Ster mentioned, got super lucky; a local coach of an opposing team saw him pitch in the spring and recommended him to his buddy on the Canes American team for the summer before senior year. He kept emailing coaches with updates and playing through the spring and summer. He was offered by three HA D1 schools by the beginning of August before his senior year. Two of the three were on his original list. He did absolutely NO social media at all, mainly because he doesn't care for it and thinks it is all fake.
So for us, it was a combination of getting our son to own his own recruiting process PLUS a bit of luck. I don't think your son needs an advisor unless you have a scout in your dining room this winter break (which is possible, of course, but will be evident pretty soon and at that point, you'll have plenty of time to find someone before the summer after senior year). Good luck and keep the group posted on what happens. It is an exciting time.