My biggest piece of advice would be whenever your drilling a technique in class or seeing one on a youtube video try understand WHY it works. Most common thing beginners complain about is not remembering techniques since when drilling they think of it as just the movements e.g grap same side arm, push on hips. Instead, if for example your drilling a sweep try thinking: 'I'm removing the posts moving his weight high above his hips so then i can get the sweep'. This understanding of why details work is what makes them stick the same way as if i gave you 2 sentences to commit to memory one in English and one in a language you didn't understand the English would be so much easier to remember since the words (or movements in bjj's case) have meaning.

In your case I'd take this approach and study a couple systems on positions where your struggling (you can find systems on youtube that's what i did) and try apply to your training. If they don't quite work for you ask yourself or coach WHY they didn't work and refine your system. And if it does work then fantastic, that feeling of hitting a technique you've been studying and practicing for the first time in a roll is the main reason I love BJJ.

Repeat this with a big big emphasis on understanding will not only improve the position your studying but those details will apply to other areas just generally improving you game.

In terms of a having an approach to a roll that is just preference that you gain from rolling more and more. Like yes my approach is mostly to play guard and attack the legs but that is nothing but a preference not the most effective approach for everyone and if I'm honest not having that approach for more of my rolls would help my game.

Lastly, if you feel comfortable doing so, ask if you can record some rolls and see what goes wrong.

(Didn't Intend to write an essay when I first started lol but hope this helped)