It's unlikely open source matters to most of your target market. Any open source advice is typically geared towards developers as users.

Look at competitors products and what people say about them, then see how your project measures up.

I can say from experience, at this early stage, one or two users can give immeasurable feedback. Keep working on the product you want and a few will come along.

Writing posts can help. You want content that can be indexed by a search engine for the permanence. Forum / social / chat posts fade quickly into oblivion