The Lincoln Saltdogs are a longstanding team which has played in the American Association for years. The team’s YouTube channel has highlights from many of last year’s games, so if you plan to one day play for an AA team then here is the caliber of play you must bring (or, ideally, exceed) in order to make an AA team and stay on the roster: https://www.youtube.com/channel/UCMo-6wIx8vv3zGAB5xbKgGA/videos
Become aware of upcoming tryouts by joining the notification service here: Independent Minor League Pro Baseball Tryouts
If you need some help increasing your 60 yard dash speed times, arm velocity, vertical leap ability, hitting power or improve your muscle mass for any professional baseball tryout (or private workout) then here are some resources to help you: Resources for improving your chances at any pro baseball tryouts