I rested for a week before xmas (may have done a few pressups and situps + went on a run with me old man xmas day) and then went out to spain for a climbing holiday where I mainly had fun but despite having not tied in for a few months previous to the trip and climbing badly early on, within a few days I had matched my previous best onsight and by then end had onsighted another at the grade. (as it was a short trip I climbed 6 days on - though these weren't necessarily massive days)
Sounds like you expect to be permanently turbocharged. Get more rest I'd say. Have a break, then spend a few weeks building up again. I took 10 weeks off in the autumn, climbed my hardest indoor problem to date this evening- decrease the quantity and focus on quality a bit more.A sign of proper overtraining is elevated resting heart rate btw. I doubt you're really overtrained, just a bit tired.
Tip - don't judge your performance on indoor grades. They are bollocks at the best of times.