Is this not your server?
At any rate, there’s no need to symlink. You can change the default PMS service defaults for such things using an override file. This FAQ question describes it in more detail:
There is one thing I’d suggest though. Instead of manually creating the directory/file as described in the link, just use sudo systemctl edit plexmediaserver to create/edit the override file.
I’d double-check the location of your linked PMS data directory. It cannot reliably be stored on network storage. If it is, you can expect database corruption.
