My rule of thumb was always to take a month off from structure training. It sounds like a lot in a way, but this doesn’t mean a month of laying on the couch. Rather, it’s a month doing whatever i want, whenever I want. Meaning if I want to join some friends paddleboarding, I do. Or rock climb 3 pitches one day and 15 pitches the next day, I do. I was active. But I avoided structure.
At the end of a month of that I would usually start to feel the itch to train again. My mind would start to think about my climbing goals for the next year and then I would know I was ‘ready’.
Hope that helps.