[QUESTION] Frustrated about about pick falling off in 2-finger hold. Any tips, exercises or resources to help with that?

At first I started learning using 3-finger hold, but then got told by teacher that it's bad and makes palm muting harder. I switched to 2-finger hold, but even after practicing for a few weeks it's very uncomfortable and pick is either falling off or moving so I have to stop playing to correct it. I am being told that I have to hold it as lightly as possible, but that only makes it worse. It really makes me not want to play guitar anymore, because after weeks I still have the same issues I had the first day after changing.

Any tips, exercises or resources to help with that? Lessons on the internet I found were very basic about it.