You can easily import music metadata to musicbrainz with userscripts: github.com/murdos/musicbrainz-userscripts

I use the discogs and bandcamp one frequently.

Install the userscript in your browser, and if you find your album on discogs or other sites, it adds a button there, and with few clicks it transfers the data to musicbrainz. Then in picard search again, or copy the link from musicbrainz to the searchbar in picard