It would be best if you validated that there is a definite need for your product in the market. To do so, you should visit your persona group and get to really understand their problem in-depth and how they currently solve those problems.
You should find out how they describe the current solutions and find out if the alternative you are offering is a better bet. If your product provides a more straightforward solution to their needs, then you are on the right track.
One place you can find your target user is on sites like LinkedIn
. With their filter option, you can narrow down the search to a job title and your city of residence.