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

There is also https://blogtrottr.com/ which has a free plan with ads. It seems to update hourly on the free plan. (I used this service for years before creating my own, I can highly recommend it). Source: about 1 year ago

There are other services available as well. The keyword you are looking for is rss-to-email. I used to use https://blogtrottr.com/ for years before making my own and they have an ad-supported free tier if you prefer that. Source: over 1 year ago

I use RSS-to-Email then read them in my mail clients. Most things get routed to a few folders without notifications that I open when I want news. I'm using my own RSS-to-Email service https://feedmail.org but I've also used https://blogtrottr.com/ in the past. - Source: Hacker News / over 1 year ago

And you can get realtime RSS→email at https://blogtrottr.com/ for free (ads in emails). Or use some other RSS app. Source: over 1 year ago

I use my own RSS-to-Email service https://feedmail.org/. I've written about my setup and why I prefer RSS-to-Email on my blog nearly a decade ago https://kevincox.ca/2013/06/27/email-as-rss-reader/. I used to use https://blogtrottr.com which I do still think is a good product, they just didn't quite fit my needs so after about 8 years I ended up creating my own. - Source: Hacker News / over 1 year ago