It can be tricky to stay on Beta to test things, when links and bookmarks etc usually send you back to prod.

It would be nice to have a toggle in https://listenbrainz.org/settings/ that lets people opt-in to the beta server. It might also encourage more users to test new features.

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P.S.
In MusicBrainz I used to use a userscript to stay on Beta: https://github.com/jesus2099/konami-command/blob/master/mb_PREFERRED-MBS.user.js
There is a toggle for beta in the footer, in the MusicBrainz site, but with LB's minimal design I would keep it in the settings sub-page.