With your server running, here are some additional things you can do.
Jellyfin has a selection of plugins that increase functionality of the service. Click the link below to check them out.
There are also third party programs that add features.
Want a simple way to let users request media? This is the app for you.
This nifty app helps manage your Jellyfin user accounts.
You can optionally test the security and performance of your server by visiting these sites