Ask HN: How do we improve the discovery of apps in appstore?

I built Libris.fm[1] , it's a free iOS app written in swift which gives access to users for 10000+ free audiobooks.

The app is objectively better than many popular apps in this segment which have a paywall and tons of ads. However i hardly get any downloads since the launch.

I have tried posting in r/audiobooks[2] and got some decent feedback. But I don't have any other clue on how to get more users for the app.

I don't have any monetization plan other than an optional tip jar that I have placed in the app.

Looking for advice on how to make more users aware of the app. This is a side project and I don't have any maketing budget as an indie developer.

[1] https://apps.apple.com/us/app/libris-fm-free-audiobooks/id6744654703 [2] https://www.reddit.com/r/audiobooks/comments/1k48lzb/librisfm_10000_free_audiobooks_with_human/