One benefit pitchers have in recruiting is velocity doesn’t change regardless of where it’s thrown. 90 on a radar gun is 90 regardless of where it’s thrown. What is lost is how you emotionally handle facing quality hitter after hitter lineups and maybe having a bad day.
Work on increasing velocity. If you hit a velocity in demand someone (coaches, umpires) will pass on the word. The problem is control of the recruiting situation is not in your control. However, if successful colleges around you will notice. You can get invited to larger travel tournaments as an extra guest pitcher to play free. All you have to do is get there. Do an individual showcase. It’s a one time charge.
Don't lock your mind into D1. Lock your mind into finding a quality college educational, baseball and social environment. There’s a lot of quality ball played at every level. At 84 you’re already college baseball material at some level.