Hi Eevo. Since you sent me a DM indicating you misread my answers, let me clarify them:
“If one lets say loses their account information(has happened to me before) is starting a new account forbidden? ”
Yes, it is forbidden. Do not do this.
“Even if can't login to old account? ”
Yes, it is still forbidden. Contact an aSim to get help restoring access to your account first, then you can log in, drop your character and make a new after 3 weeks.
“Or if that happens can you start a new account as long as you don't use your old account at all? ”
No, you cannot. Do not do this.