A Plex Pass is not needed for remote access.
You should first peruse The Basics of Remote Access Troubleshooting
But it is possible that even this won’t yield success for you, because many residential internet connections don’t provide a publicly accessible IPv4 address. (Which is unfortunately still needed for 90% of remote connections.)
Some ISPs provide you with such an address for a fee (it is usually coupled with a “fixed address”), but some ISPs don’t offer this at all.
