Daksh is absolutely right.

You need to ask yourself why people want to move from one database to another.

Then ask what else they need to make that move and where would they go to get that. Then get in front of them there.

Maybe there's some kind of situation or problem that prompts them to move. What else are they likely to do (what kind of research will they do, what other types of products will they look at, where will they go to try to solve the problem)? Can you get in front of them there?

Who will they go to for help or advice? Can you find those people and tell them about your product so they refer prospects to you?

Ironically, the broader a product's reach ("any database to any database") the harder it is to market. Show me a product that can be used by exactly 17 companies in the world and I will show you a product that is easy to market.

I learned this the hard way. My company sold a product that was cross-industry, and frankly could have been used by any company with a mainframe (any of the 10,000 or so largest companies in the world). We marketed to "everybody." I realized much later that it would have been better to have been the best possible product for some of our core markets: banks, municipal governments, retailers. (The enlightenment came from "Crossing the Chasm" -- which I highly recommend.)

Is it possible to focus? Your customers so far: is there any pattern to them? Financial institutions? Software companies? Retailer? Could you try focusing on those customers? It sounds silly, giving up on millions of potential customers to focus on thousands, but at this point, you'd probably be happy with thousands of sales. Use those sales to leverage your way to another market of thousands, and then another.