Welcome to the group.
Some of the leading keto doctors are also sports scientists/doctors and their early success was in sports medicine so there is a big link between keto and sports performance.
We can expect a performance drop in the early stages, as you a keto adapting, the word on the street is adaptation takes a few weeks or a month or so but to fully adapt Dr Volek speaks of 12 months+. However after adapting we’d expect to see better performance than ever!
So give it enough time but check out Drs Volek, Phinney, Tim Noakes, Peter Attia. I’m sure you’ll pick up lots of help information and encouragement.
Otherwise just hang in there … I stopped having lead legs after about 3-6 months (sorry can’t remember exactly when, besides we’re all different).