This is really cool. I've worked on a lot of side projects in my free time, and my most successful one (https://apps.apple.com/us/app/id1607228378) pulls in just $11 in MRR. Even though it's so little, I get really excited when I get a new subscription or a subscription renews.
I've had a lot of trouble trying to market the app. I've experimented with Instagram ads, but the conversion rates were really bad. I'll try the Instagram accounts strategy you mentioned and hopefully that helps.
"A delay of less than 100 milliseconds feels instant to a user, but a delay between 100 and 300 milliseconds is perceptible. A delay between 300 and 1,000 milliseconds makes the user feel like a machine is working, but if the delay is above 1,000 milliseconds, your user will likely start to mentally context-switch."