Hi everyone, I'm the creator of the Keepmail product - our main profile is protecting your email, yes that's exactly what we think. But it all went wrong when we went on Product Hunt.
Coming to Product Hunt was very interesting for us - we reached the top 10 in a day and then 60 in a week, we thought we were in just such a niche that this is quite a decent result - https://www.producthunt.com/products/keepmail-hide-email-yet-stay-notified#keepmail.
And then I started to observe how the service is used.
I'll stop here for a bit and tell you more about what we do.
Our main case of using the product, as we thought, will be a story related to the creation of accounts on any resources, so it was.
I conducted one castdev, then I conducted a survey and found out that some of the most active clients we have now are clients who subscribe to newsletters. And here's why it's convenient for them:

Now if some subscription bored a person, he can easily unsubscribe from it, at the same time he will actually unsubscribe from it, but if suddenly he needs it again, he can resume receiving it.
This case study wasn't the most obvious one for me, so communicate with your customers and ask for feedback! And I went off to think about how to improve a component of my service.
There are some ideas regarding Discord and WhatsApp.
P.S In a month after the release, we have gathered around 270 like-minded people who use us.