What about doing your best at something you're terrible at? Sometimes no matter how hard you try, you still make a little impact in a big industry.

If you got into your field of expertise with ease, find it lacking in challenges. with little impact, maybe it's time to try your best at something new & difficult and therefore perhaps more rewarding.

Even moving into a field with a wider scope, something critical that benefits others greatly. Success and job satisfaction can be found in many places other than 'being the best' or being in an enviable position.