How can I reset an account, thx for help

I created a user (for example, alice) when I signed up an account.

then I tried to install wordpress manually, but after an hour I gave up.

I deleted alice, wanted to reset the user and try again with exp i got in the past hour.

I found alice is still used.

So my question is, how can I really clear up my account with nothing left, with no user “corpses” lied in somewhere even I’ve delete then…

I don’t want to create another corpse once I tried.

I searched for the question but maybe the key word is wrong.

3x for read it.