Well, to be honest -- what my best looks like to others doesn't matter to me. As long as I know myself that I'm improving, that's the real ticket. And I mean "others" by people who don't know me. Because those who are close to me will stand by how I improve myself for myself.
I cannot measure my level of success and best to someone else because we may have different goals, may have different sets of skills, and may have different ideas of what success looks like.
At this point, it sounds more like inner idea of self-confidence than actual objectivity. Like, even if objectively, you're not considered the best and that someone will be better than you -- are you cool with that? Can you still keep improving knowing that?
My personal answer? Yeah, I can. I really don't care if my "best" is considered "nothing" in the eyes of others perceived better than me.
I didn't ask for their approval, and I don't do what I do for them. I got better things to do than worry about how I stand compared to them; it's a waste of time, and time is value. Quite frankly, they might not even have my best interest in mind. Their idea of changing for the better could even screw me over in the long run and change me into something that, objectively, is not good for me.
If my best now is better than my best say, 5, 10 years ago -- then I've done my job.
My thinking is in the same thinking modernist artists have done to the traditional masters before them:
"Screw your opinion, I do what I want."