Migration from Windows to MacBook Air and creation of 2 administrator accounts

Hello everyone, I just bought my first Mac and I am facing a problem that I can't solve.

I set up an administrator account on first startup,+ already configured my email account. Then I did the migration from my old Windows PC and now I end up with a second administrator account (with the name of my old PC), containing all the migrated files.

I know that it is not possible to merge two accounts on Mac, I would then like to know how to delete one of them being both administrators.