ao3 username thing

i wanna change my ao3 username (its deerfeathers rn) but a while back i commented on something on tumblr telling a bunch of ppl a fic i wrote w/ the username n i cant edit the comment. but i also want to change the username . but then people wont be able to find the fic cuz ppl are still liking the comment n thats how ik ppl are still looking for it ig. TwT