I like this perspective from Ed Sim on recognizing that you can’t always build yourself into product-market fit…

There is no easy answer for a lack of customer traction, but my one suggestion before you commit to the idea that you are one feature away from success, is to go back to the basics and first ask if this is the right user or customer. If you believe you have that nailed, try multiple messages and keep learning from every interaction. You may have the right product today but for the wrong user. Or you simply may just have a cool technology in search of a problem to solve in which case you should start completely over.