16 Year old pitching mechanics

Hi my name is Austin DeCotiis and I am 16 years old. I am 5’11 165 lbs, I am looking to increse velocity and looking to relieve stress on my arm. I throw in the low to mid 70’s. Here are my mechanics I am open to all suggestions/critism. Thank you
Also am very new to this site

you can also email me at bronxbombers21x7@yahoo.com

Very difficult to give any real analysis in basement vids…One thing I will say, Loosen up man, you look way tense and way caught up on form/looks…to heck with that, relax and throw the baseball.