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.