Brown/Black Belts: What do you still suck at?

I’m a brown belt with nearly 12 years of training under my belt. I was talking with some of the blue and purple belts at my school the other day; they were talking about the intricacies of K-Guard, and I realized that I couldn’t teach a lesson on K-Guard if you offered me $100. It got me thinking about the things I still don’t have a deep understanding of in jiu jitsu. I have my solid game and enough technique to switch things up - things I can and do teach full lessons on. That said, there are a bunch of things I suck at. For me, it’s newer guards like K-Guard and Worm Guard. I also suck at passing deep half (a work in progress) and breaking the leg lasso.

What are your things that despite having a lot of time in jiu jitsu, you just can’t wrap your head around?