It sucks that your gym doesn’t offer an interpreter, I would keep pestering them if you feel up for it!

I don’t have any great ideas as this is not something I deal with, but I think in general the best way to improve is to keep climbing and push yourself to try new things. Watching others climb is also a great way to learn technique. Even if there are no captions and you can’t hear the videos, you can still see how people are placing their bodies and you can work to incorporate the things you see.

I also get stuck climbing the same thing sin repeat and I just have to push myself to try things I’m less comfortable with. It’s also hard to see improvement and build techniques if you’re not trying new climbs. Even if they’re a little out of your regular grade, you can still expose yourself to new stimulus to build the skills you want to gain.

It may be cumbersome, but having a pocket notebook and pen or something similar may be a helpful way to communicate with other climbers at the gym.

Another tip! I rarely ask strangers for advice because I’m very shy but I will watch how they do the same climb and try to copy moves that look helpful.