One piece of advice that has allowed me to climb way harder grades:
If you are stuck on a section of a climb, and you mind your mind racing about how “bad” a hold is, or looking at all the things you can’t use, your stuck in an unhelpful thought pattern.
Instead, when I find myself in these tough positions I look for “options”, my eyes look around for things I CAN use.
It seems obvious, but looking for options rather than just thinking about the lack of them allows you to notice holds or consider moves you won’t think of just sitting there thinking “this crimp sucks”