Well this is a weird non sequitur.

Growth mindset has literally nothing to do with "top notch performance", or a guaranteed way to achieve success in any and every field of practice.

It's simply a framing exercise for how you handle failure and how you approach new topics and challenges.

And I will cheerfully disagree, many top notch musicians can't sing, and many great singers are no musicians. You could have been great - you could still be great!

But effort and persistence is a much wider gulf than talent.