I generally don't watch YouTubers because it's basically filled with opinions neither right or wrong but pointing the obvious. Watching pro matches would probably be your best bet and taking/applying your own ability.
I don't know your opinion on it and my time is relatively short, but I'd happily queue with you or anyone and aid any constructional critism or just to have that conversational enviorment. I don't really play hard anymore but ex-3900 Hanzo main that was tired of trying to hit demands every week where I'd often lose 200-300sr because I was busy.
Granted, I'm not the best or right. I've just been in and out of competitive teams since 2004 and after 22 or 23, dealing with hothead 17yearolds gets tiresome because they're impervious to wrongdoing. /Shrug