Do you know what a “plateau” is?
It just means you don’t know where you want to head next.
There’s no reason for it, there’s no mechanical cause. Your goal has gotten hazy or has moved off, and you lost sight of it for a second. That’s a plateau. “Where am I heading to, again?”
It’s not your skill, and it’s not the instrument. When you stop your car in traffic, you don’t ask existential questions about why you aren’t moving. You aren’t moving because you have your foot on the brake. If you’ve pulled into a turnout, chances are you aren’t moving because you aren’t sure what direction you want to go in. Popping the hood and looking in there won’t help. You need to figure out where you’re headed. In other words, you’ve popped the wrong hood. Pop the other one.