when I'm on my back I like to rock slightly to a side to let them try to escape away from the choke and then switch choking arms on them at the last second. its demoralizing because they think they're almost out and then they're caught again.
I also occasionally set people people up by crossing my feet. They go for the simple ankle lock counter and that gives me the window I need to secure the choke.
I also get lots of RNCs by threatening with collar chokes but that doesn't work without a gi. I think a lot of it just comes down to details, like sliding your thumb behind their ear down under their chin
A mind is a terrible thing to taste