Here is my product: https://matchkraft.com/. It is a marketing toolkit. I think you need to ask for feedback, asking why users don't want to pay for a premium subscription. So far, you are getting new users that is a good sign you are going to the right direction. Maybe, who is your ideal customer or maybe your product is ok but need more visibility (maybe paying ads). Try to get active users. I really want to... Source: about 1 year ago

Calling a 3rd party API: There is a complete ecosystem providing "google-sheets-as-DB". I personally tested and recommend https://sheetson.com/ but there are a lot more with free tiers https://sheetsu.com/ https://sheety.co/. Source: about 2 years ago

My name is Mo the creator of appicon.co I’m sure some of you have you used it once or twice. Source: over 1 year ago

You can use something like https://appicon.co to create them all from a 1024x1024 then drop the entire folder into your project. Source: over 1 year ago

App Icon Generator can be used for generating the images. Downloaded images should be stored in mipmap (android/app/src/main/res/mipmap-*hdpi/ic_launcher.png) folders. - Source: dev.to / over 1 year ago

There are a lot of icon generation websites like https://appicon.co you can restrict the size with constraints and set the content mode to aspect fit. Source: almost 2 years ago

Generate the pack of icons for Android and iOS here and unpack it. - Source: dev.to / almost 2 years ago