Do you feel like you can't get better at Jiujitsu? I'm going to share with you how to improve on things you most care about, not only you jiujitsu game. There are two zones where you spend your time, Learning zone and Performance zone.
Learning Zone is where you go to improve. The activities you do are for improvement and you'll be focused on things you haven't mastered yet. On this zone you will have many mistakes and that is ok, you are in the process of learning.
On the other hand, we have the Performance Zone, which is where you do as best as you can. It's time to put in practice all you have learnt and minimize mistakes. When you are in this zone, you are concentrated on techniques you know inside out.
However, why do you feel like you're not getting better? You might be spending too much time in your performance zone. You have to keep in mind that the more time we spend in the Learning Zone, the more we will improve. As Briseño said, "Once we think we have become good enough, then we stop spending time in the learning zone". This is probably the reason why you can't see any progress.
Therefore, you have to alternate between both zones. Try to find the perfect balance and learn new things. Once you are good enough, apply them in your performance zone.
I really hope this is helpful for you. In case you want to learn more about it, watch the the full Tedx Talk by Eduardo Briseño here.
So, how would you apply this to BJJ?