I was is in a similar position some time ago (albeit with a very different product).
Long story short: Understanding the complexities of why a certain problem remains under-addressed was difficult in our case. As a result, we ended up pivoting into the direction of helping (potential) founders validate ideas through a specialized search engine of startups. We just launched a beta version of this on https://www.symonda.com - while many features are still lacking, maybe it can still be a useful resource.
Our goal is to help people discover, test and validate startup ideas. We believe that a powerful free-text search engine is the best way to achieve this.
At this time, we focus on helping people find companies via their product and service offerings and not so much on 'who they are' (i.e. company characteristics, investors etc..). This is a fundamental difference to those platforms you mention.
Long story short: Understanding the complexities of why a certain problem remains under-addressed was difficult in our case. As a result, we ended up pivoting into the direction of helping (potential) founders validate ideas through a specialized search engine of startups. We just launched a beta version of this on https://www.symonda.com - while many features are still lacking, maybe it can still be a useful resource.