If you no longer have access to your account, you can delete it by visiting this link: https://www.linkedin.com/psettings/delete-account. You will need to enter your email address and password in order to delete the account.
You can’t delete your old LinkedIn account without a password.
LinkedIn will only delete an account if it is inactive for a period of time. If you are still using your LinkedIn account, then there is no need to worry.
Yes, you can have 2 profiles on LinkedIn. However, it is not recommended as it can be confusing for people viewing your profile as they will not know which one to look at.
There are many fake LinkedIn profiles, but there is no way to know for sure how many there are.