Deactivated Facebook- can’t change messenger picture?

Hey.. I deactivated my Facebook around a year ago, but kept messenger to stay in contact with friends. I am unable to change my profile picture on messenger though and can’t seem to find a way to do this. All the answers online say there’s a small pencil icon to change the picture, but this is only available IF you have an active Facebook account.

Is there a possible way to change my picture on messenger WITHOUT reactivating my Facebook account?