Thread:AmbyRO/@comment-43594770-20200513001406/@comment-39340968-20200513005221

Actually Gaia's answer is true if you completely disable the account and start over on a new account

However, if you use Special:UserRenameTool, the contributions should automatically transition under the new username, while the old username will be unusable afterwards. The edits from the old username will carry over to the new account (unless you disable the account with the rename and create a new one).