I think we’re all already doing that. If someone is falling short of what you might call their “best”, that’s a problem with your measurement, not their effort.
I used to have issues with anger. Had you seen me at the time, you might’ve thought I wasn’t trying to be better. Honestly, at the time, I’m not sure I can truthfully say I was trying to be better.
But I know now that my anger was caused by childhood trauma, and I was dealing with it the only way I knew how to at the time. I was being my best self, but to anyone else it looked like I was at my absolute worst.
You are exactly who you are, and the reasoning behind what you’re doing isn’t always obvious - even to yourself. I think that no matter what you do, you’re doing your best at it simply by virtue of doing it at all.