Second, take this for what it is: your product may not be compelling in its current form. Building it to many different markets will not make it compelling. If you had a stronger revenue, please share it. This sounds incredibly thin.
Third, dont mistake building the same thing 20 times for different verticals for bonifide software skills. When a SWE builds the thing they have built before its usually to learn a language which is the easiest part of software. There is a reason a common adage in software is "9 women cant make a baby in a month". Breath is no replacement for depth.