Most BJJ instruction is useless. If you aren't gifted and in the first group of students that join the school, you'll never get anywhere without a high IQ, most places, most of the time. You have to take matters into your own hands.
The best way is to get a basic grappling guide online or make your own by figuring out what the list of most useful BJJ moves are. Whatever you put together will be wrong, but it will be on the right track. Buy some BJJ private lessons from a purple or brown belt that's hungry to teach but will let you drill on him. Master the complete list of basics. Maybe a solid 6 takedowns and 100 ground moves, with multiple entries for the take downs, but only the easiest ones you can get by winning a grip fight.
After you do all that, you'll know enough BJJ to teach yourself for a long time.
I trained for about that long and didn't know how to do anything. After 2 years the only way I knew how to get out of side mount was by feeding my leg under them to encourage them to mount, then feed them and armbar so I could come up to my knees. It was horrible and I was never corrected. I didn't get better until I took an interest in the art and learned to teach myself and force the correct information out of purple belts.
Remember that most of these people who are good are either very smart, or were in the first batch of people that got a lot of private attention, or they started very young. They will tell you that certain skills will come with time and rolling, when they probably will not. You have to learn specific things, like how to hold your body in each position, where the best place for your hands are in each position, and how to hand fight into those positions. They won't tell you how to do those things, most places most of the time, unless you make them. You have to educate yourself so that you know what questions to ask.
A couple years ago I was training at a gym. One of my partners had competed 5 or 6 times and had four stripes on his white belt. He didn't know how to upa or recover guard from side mount. I taught him. It sort of made me mad. They weren't teaching the guy shit.