for support you need to contact the admin of your instance. there is no 'lemmy support'.

also, don't use 2FA, idk if it got better but there was a time where a lot of people lost their account because the instance glitched and 2FA was reset.

just use a bitwarden generated password ~20 chars and it is ok.

another advice, if you messed up an account, create another and leave the older. i don't think the admins have the tooling to restore 2FA or reset your password.