Lefty Pitching Mechanics Help

Hi everyone. New poster, but have been reading for about 6 months when I came across the site.

I’d like to ask for mechanics advice, please. A bit of background. I graduated HS in 2003, where I had no pitching help, and there was no travel ball within 50 miles, so my mechanics were about the same as when I was 12. I started playing in an adult league last year, have been using the TuffCuff system since September to improve velocity, and I coach at the HS I teach at now. I’d like some suggestions on what I can do to make my mechanics better, as (you can see from the video) I do NOT throw hard at all (probably low 60s- if that). Thanks everybody!