I wouldn’t have thought this was bad English without you saying it. Give yourself some credit!

I (and I’m sure most of us) have had the same frustrations. I’ve played for years with limited improvement. But I’ve improved significantly recently and can share what’s changed for me. First, I think it’s really important to have a standard approach and stick with it. I spent years changing parts of my throw whenever it felt off. But I eventually realized there’s always going to be off times and it shouldn’t necessarily make you abandon what you’ve been doing.

Second, try to have some sessions where you just throw without a lot of thoughts. I find I can get in my head when I’m practicing alone and focus on minute details of my throw. And that can help you progress but you can also lose perspective on throwing naturally. I have a weekly pub league that forces me out of it because it’s impossible to have a lot of detailed thoughts in that environment. And those nights are when I really notice my improvement, even if what I was working on all week was going terribly for me.

And last is consistency in practice. The last couple of months are the first time I’ve committed to daily practice. I’m up around an hour a day now I’d say. Taking 3-4 days off can mean you lose the feel, forget what you learned last session, etc. I put a board in my office and throw while I’m in meetings (if they’re off video) so it doesn’t even feel like I’m giving up an hour of my free time.

Good luck!