In your particular case, you have identified a problem (restaurant owners finding it difficult to keep their online menu's up-to-date). Is the problem real? Ho

In your particular case, you have identified a problem (restaurant owners finding it difficult to keep their online menu's up-to-date). Is the problem real? How did you find out? Talking to a few restaurant owners (who are keen to discuss) is the starting point. This will also give you insights into other adjacent problems (eg. why should I have to update my menu on my internal database and web portal?). Is the problem worth solving? How often the restaurant owners need it? Is it important enough that they will pay for it? Do you believe you need to bill for it, or give it out for free to build the base for a future paying product? As pointed out in the comments, go-to-market is really important. In your particular case, you have the opportunity for self-service acquisition, or via affiliates, or via partnership with Uber Eats, Yelp etc. to simplify on-boarding for restaurants. Go-to-market becomes a deal breaker as soon as you have a good product-market-fit.