I would look at adding new features and maybe adjusting pricing, test a sale price for the new version. What is your target audience? I would spend some time w

I would look at adding new features and maybe adjusting pricing, test a sale price for the new version. What is your target audience? I would spend some time writing blog posts on how your app can help them. Maybe give away some copies/keys on podcasts that your target audience listen to. If that doesn't spark sales maybe go free with IAP. I would do this as a last resort. I think you'd do better being paid. Maybe introduce a free trial period if you don't already. I don't think ads or patreon will make any significant revenue.