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: 12 months 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

If the grandparents enjoy getting physical mail and like hard copy photos to have around the house, then https://nanagram.co is a good option[1] You just text in your photos and they printed and shipped once a month. We use it for my mom to send baby photos and she loves it. [1] Full disclosure: my older brother built this service, but I don’t have an affiliation other than being a proud brother and happy customer. - Source: Hacker News / about 1 year ago

Nanagram- hard copies of photos sent on a monthly basis. Great for the scrapbooker family member. Source: about 1 year ago

I'm not affiliated, but I have been using Nanagram for the last couple of years to send prints to my Mom. Source: over 2 years ago

That is adorable. You know what she'd love? NanaGram. Send her back 3 photos of you for free on our home page. Source: over 2 years ago

4. Grandparent gets envelope of printed photos just like the ones filling their old albums on the shelves It really is that easy. It’s affordable. And the founder is very responsive to any support inquiries. It was a service I always wanted to build myself but never had the time. I’m very grateful for it. [0] - https://nanagram.co/. - Source: Hacker News / about 3 years ago