^Yes, that would be so cool! I suppose it took me about a decade to be able to self-coach constructively, and it's still not the same. I have just one one data point: me. I don't know what I don't know, what's outside my box. I agree with HP entirely. On the road though, I can test myself fairly easily and do. After I warm up for 1/2 hour - hour, I should be able to power up and hit my HR numbers for that RPE. I don't have power, but with experience HR works quite well. If I can't hit my numbers, I change the workout, either cutting it short or cutting the intensity. Knowing just what to do takes experience.

All that being what it is, I really enjoy that feeling of powering up the engine and seeing the result, whatever it is. Sometimes I can see I need more food. Other times I need more water. Other times I need more rest. Most times it's just what it should be.

In the OP's specific case, most times I would go for a workout on the n day and rest on the n+1. You can usually take more punishment than you think. However if the numbers weren't there, that would be a signal for a short ride and then a rest day. When I can't hit my numbers, it usually takes me more than one day to get it back, but then I'm old. So I'd usually take a rest day and then an endurance day and then see how I felt - have another go at it and see what the numbers were at the appropriate RPE. IMO it's not just the numbers, it's how gassed you are when you're hitting them.