Please give me the truth as you see it, even if it might be difficult for me to hear.
I promise to receive it as a gift and to take onboard what I can.
I also promise not to react negatively, even if it smarts.
I sincerely appreciate your generosity and perspective.
Finally, it would be helpful to know who you are, for context, and so I may reach out to say thanks, to clarify, or to take action as appropriate — but you can submit anonymously. I'll take whatever is on offer, attributable, or not.