If your music is already on YouTube Music, you can grab your artist link by visiting your artist profile at https://music.youtube.com/.
Use the search bar at the top to find your artist name.
Once you're on the artist page, click the three-dot menu next to your name, choose "Share," and then click "Copy" to copy your unique YouTube Music Artist URL.
It will look something like this: https://music.youtube.com/channel/EXAMPLEURL