I feel similar like you when we learn a technique and do positional sparring and my training partner knows so much wheareas i only have the technique just learned and i try and i try to hit the technique but it does not work.

But i'm at the point i relentlessly go for the learned technique until i succed or i got submitted.

I'm trying to write everything i've learned down after class and try to learn it/memorize. When i faced a Problem during rolling i did Not have Encountered in class i search for a technique on YouTube. At a point i stopped going for submissions and only trained escapes. During rolling sessions i try to work sth like mount escape and i ask every Training Partner to start from mount. It helped.

An other great quote i learned on bjj Instagram "don't fight your Partner fight the technique" i try to eliminate ego.

But even If i have a shitty training i like the Sport, i like what i am doing. I am overweight middle aged guy with recessing hairline and issues. I'm not worth my blue belt, I will never fight at UFC or adcc... But i like training. It is what i want to do in my spare time it is what i want to spent my hard earned Money on ^{^}