as long as your FF has all the useful user data you need to be happy and functional, you can "can" that FF account and create a new FF account and then sync up to that new account

you will however, need a different email address to accomplish the above

I published addons from my account. So if i create new email then i will no longer access my addons.

If 2FA is involved then there is no way to access the account if you lost the authenticator and the recovery keys you can use instead. This is how 2FA works and there are strong security measures.

• https://support.mozilla.org/en-US/kb/what-if-im-locked-out-two-step-authentication
• https://support.mozilla.org/en-US/kb/secure-firefox-account-two-step-authentication