I have never critiqued a script, but I did take a screen writing course awhile back. It was part of a promo for Final Draft, the software almost all screenwriters use. I got free use for three months of online lessons. It was very good but I didn’t see the need to spend that much money until I actually needed to write a script.
I don’t know if they will offer something like that again, but they have great resources on their site. https://store.finaldraft.com/final-draft-12.html
I would be happy to look at your draft. Not sure my comments will help or not.