Ask HN: Scaling up from 100 iOS app subscriptions

I have a simple accessibility utility for iOS that now has ~100 $0.99 monthly subscriptions, but its growing really slowly.

I have a free 7 day trial, that according to App Store Connect converts at 56% with an 86% retention rate. However these figures are based on 150 free downloads per month, which is really low.

What strategies can I use to increase the number of downloads the app gets in mid-2021?