Growing Users in SaaS Business

I built out a ML as a service business where users can build and deploy models in less than 10 minutes. Through my promotions I get lots of traffic but not enough traction to grow my user base. My base offering is completely free but that doesn't seem to be enough to excite people into joining. I want to help make machine learning accessible to as many people as possible. I attached a marketing use case page here. I think Marketing, Real Estate etc. would really benefit from my service but haven't been able to validate this. Any ideas on how I can better communicate my offering? Ay specific advice from growing products yourself?

Thank You!