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

You should definitely check for "Do not sell my personal information" notices (and whether or not you have disabled them) as well as sites like https://haveibeensold.app/, https://haveibeenpwned.com/, and https://breachdirectory.org/. Aside from that, you should try using a VPN and firefox w/ duckduckgo for a few weeks consistently. After that, simply getting your home IP changed by your ISP should stop all... Source: almost 3 years ago