I am not an instructor.
I can tell you're struggling with some of your recent posts. We get burned out at this game and eventually the winning attitude is gone. Everything is against us, let's go eat worms. At some point it's hard to keep interest, then there is the slump.
Honestly with the time of year it is get out in the woods and find some morels. Your head will be clear from worries. When you come back to the table after a week or so off while hunting mushrooms you will play better. Finding mushrooms is a skill that translates directly toward the pool table. You have to pay attention to find them and they get your eyes "excited" to see what they need to see. Stuff looks interesting.
For me personally, slumps usually occur when I start playing good enough I don't have to think and get into autopilot. It happens slowly, but eventually it leads to laziness, lack of focus, and the fundamentals fall apart. One thing snowballs into another then you think it's over, I finally am on the downhill side of this game. But it doesn't need to be that way. You have to be interested enough to re-discover the fundamentals and feel every shot. Feel the beauty in it. Don't worry about results right off, just evaluate the quality of hit/stroke.
It's usually something dumb like rushing, or half assing because you see only doom at the table. Bad layout, tough shots, etc. I know it's hard but get interested in the challenge, see it as a puzzle to be solved. Be realistic, we can't run everything and beat the ghost every time etc. But we can find the joy in solving the problem on the table. And when we can no longer find that joy, stop being a masochist and take some damn time off. Plant a garden, go fishing, pick some mushrooms etc. The table will be there when you get back with a clear mind and a better mind state.