Go do something else for awhile. There's too much else to do - I know this is heresy on this forum But sample all of nature's and mankind offerings and return periodically to the ones that make you really jump out of bed in the morning

In my case I've road raced, MTB'ed, ran upto a marathon, done various tri combinations, paddled(designed and built my racing canoe), inline skated, x-country skiied(classic and skating), alpine skiied, swam, played with sports cars, did equestrian riding(still own two horses), pumped iron, racketball, handball, wrestled, football, baseball, hunted, fished, golf, tennis................. next on the list archery, kayaking, turbo installation............... Most of these were at competition levels and many I return to every know and then. The beauty of endurance related activities is that you can migrate to new ones and be up to speed rather quickly.

And then there's all the intellectual activities - past, present and future but that's another post

I've come to learn that if you have to ask yourself "if you're having fun", then you're not having fun anymore and it's time to re-energize