I agree, I'd been singing a lot since I was 7, including touring Europe when I was 11. I didn't stop practicing at any point in there but also never had access

I agree, I'd been singing a lot since I was 7, including touring Europe when I was 11. I didn't stop practicing at any point in there but also never had access to professional voice teachers because of the cost. Taking a single course in college that got me a little one-on-one attention (just one in a class of ten or so) improved my technique so significantly that I can compare recordings of myself from before and after that class and it's night and day. I don't think I'd have figured out what I was doing wrong without that attention, but they were able to hear it instantly and recommend solutions. And that's with a solid decade plus of experience in choirs prior to taking that class, it's not like I was a true novice. It's just really not as easy or obvious as it looks.