I am a college pitcher and throw very slow fastball tops at 73 and normally in the 69-72 range. I am looking to gain velocity and I know my motion is very bad looking to improve it.
Don’t be too down on yourself man, those mechanics aren’t too bad at all. What I (and everyone else) will want to see is you actually throwing the ball. The load on the arm changes a lot of things in the mechanics. Find someone to catch a couple pitches and record that!
Hard to tell at this angle but looks like your stride is landing open (3rd base side) and fairly short.