I don't believe in coaching. The best way is to watch twitch and learn from people during hands that you play in.
I think this is a bit shortsighted.
Everyone has some hidden leaks in their game which a good coach could easily find while you yourself cannot.
I can easily point some weakness in my game, but I'm sure there's a lot more leaks I'm not even aware of.
I do believe though, for someone who does not believe a coach would be helpful it's a self-fullfilling prophecy as indeed, the coaching would most likely have about zero effect.
Otoh, for someone open minded and ready to accept criticism and good advise it will be very helpful.
For me I think I would be embarrased about my play after a coach analysed my game