Chess lessons, always the same lesson

You should not be getting the lesson over-and-over-and-over.  If you are doing your required homework and still not getting past that lesson, a good teacher would teach the same learning goal in a different way or determine what background weaknesses are preventing you from understanding and executing the new information.

As a retired chemistry and physics teacher with an Advanced Teaching Certificate and AP (College Level/Credit) Certification, whenever my students were NOT learning something despite repeated instruction, it was clear they were deficient in a prerequisite needed to learn the new material or that my method of teaching to that learning goal was not appropriate and not working with them,

I would first try approaching the learning goal from a different viewpoint or stressing different ways of learning (hands-on, seeing, reading, rote, abstract thinking, etc.) and if that failed I would do an assessment to see if they were weak in some aspect of math (usually the case) or science background and do a lesson to address that weakness so they would be able to master the original-failed learning goal.

That's not advanced teaching stuff, that's the standard way that certificated teachers are trained to analyze and adjust when learning isn't occurring.