How can I delete a email account to which I don’t have more access?

Lorenzogomez 

If you don't log in at least once a year, the account is inactive and purged and the only way to recover it is if you have the password - resetting the password wont work.

If you haven't accessed the Microsoft account in more than 2 years, it will be deleted (closed for good).  Once closed, addresses cannot be claimed or reclaimed, or otherwise reopened. The exact time frame for automated closure depends on when you opened and last used the account - but if you don't try to log in again, it should be gone sometime after 2 years from now. 

Microsoft account activity policy:
https://go.microsoft.com/fwlink/p/?linkid=2086738

Contacting support won't do you any good - per this  disclaimer that was previously at the end of Help with the Microsoft account recovery form 
"Along with using strong passwords, encryption, security contact information and other technology to keep your content safe and secure, we have strict policies on how our advocates can help you with your account. Only you can reset your password and make security changes to your account."