Zero reviews = no install. 5 reviews = install permission. 30 reviews = competitive. The jump from 3 to 30 is the highest-ROI marketing move you have. DM your first 30 users individually asking for a review. Not a broadcast, individual messages with their name. Conversion rate is roughly 30-40% if you ask right.
I have great ratings but only 3 reviews, so nobody trusts it yet. Write a short, personal review-request message I can DM to my first 30 users individually, using their name and referencing their use, plus a one-line in-app prompt to ask at the right moment.