if you want a Primal.net address, you need to purchase Primal premium. You can setup your own or use a service provider, such as my service,

Nostr Plebs | Get a Nostr Address (NIP-05)

Nostr Plebs is an easy way of getting a NIP-05 identifier/Nostr Address and other Nostr services, made by Bitcoiners, for Bitcoiners.

If you have a website, you can set this up yourself so you can be found and identified by your website that you're know by.