I don't like letting people down.
I feel guilt and shame when someone says "you promised" .....
But what I know I can promise .... is simply to try. Not anyone else's definition but my own.
And just try.
I'm afraid to even say "my best" .... because I don't want to get trapped into an idealistic perfectionistic "try" that is frankly impossible.
Do what I can. And that's enough.
I promise to try.
and then be specific. What I can do. I can try to think about it. I can try to take a first step toward it. I can simply TRY.