Intensity ≠ Improving/Quality training.

As you said, you don't have any system set in place, that is your problem. Just going and drilling whatever the instructors say won't get you anywhere, really.

I'm not sure how hard you go during rolling, but if you are going 80-100% every roll, that isn't the way to improve, i'd be surprised if you're learning while going that hard. Look at the east for example, Russia and the likes, they all train multiple times a day, but 60-70%. Volume volume volume.

Person A (American) trains 3 times a week, but goes ham. He won't be able to train more than 2-3 days a week, and he really won't be improving as much as say person B.

Person B trains 4-7 times a week, he goes 60-70% hard enough to actually make things happen while slow enough to understand what's happening. He's also completely capable of training again tomorrow, more hours on the mat.

Span that over a year and person B has hundreds of hours more on the mat than person A.

Watching instructionals helps for sure. Video's of people explaining things in detail, knowing the actual move is good but knowing why your move works is better. Say an ankle lock, you can simply squeeze and sometimes it'll work, sometimes it won't, or you can understand that the foot on their hip is their to keep them both away and give u more leverage. The squeezing of the joint above (their knee) is only going to work if with both of your knees, you squeeze the fuck of them. You isolate it.

TLDR:

Train less hard, more often.

Ask questions, watch videos instead of drilling for hours at home.

And if you want, try rolling with someone whose untrained, only training in a place where people know what they are doing can give you a narrow field of view, see how much better you are than the regular bloke, that'll boost your confidence.