Hello! Have flagged the Mirlo login issue and will get back to you shortly about that.
A few of us are chatting about discoverability issues and possibilities over here if you have any thoughts: https://the.socialmusic.network/t/discoverability-on-the-fediverse-and-thought-dump/544?u=roberta
I believe NHAM are working on some discovery-based updates soon as well: https://nham.co.uk/
There’s also this growing list where you can add your newsletter: https://hyaline.systems/blog/directory-of-artist-and-musician-newsletters/