The best kind of not-at-your-best-ness is when you’re learning something. You’re not at your best yet, because you’re going to (rapidly?) get better.
It’s exciting to be not-at-your-best but getting better, surfing your potential, growing.
But the day will come when the personal bests come more slowly, or stop coming all together.
That’s the time to (a) make sure you enjoy what you’re doing for its own sake; (b) are happy with the contribution that you’re making, regardless of not reaching your best; or (c) start doing something new.
Why not aim for all three?