Based on your own description, you definitely have a good chance. 6'4 lefty with MLB average fastball and two other quality pitches will get you drafted or signed. Work on mastering all your pitches. Lefties with one plus MLB out pitch that they can command often have long careers.
Try to get into a summer college league.
Best of luck
Yeah. The description I gave is an honest one. I was close to getting signed as a free agent in the Dominican Republic so I really think I have a good chance. But anyways thank you so much.