You have produced a user productivity application without talking to actual potential users, and without a real client in sight. You now expect to be able to sell this to real companies in a year where they are heavily focussed on cutting costs? Medicine is your target, and that is in worse shape than most.

Pardon me, but working without feedback like this is like trying to thread a needle without looking! Or like trying to walk without an inner ear. Theory says that you can do it, but examples are hard to find.

But if you have a product that will be appreciated by users, then learn something about negotiation before trying to sell it. Getting To Yes is good. Decide on a strategy. This year that strategy had better be, "Here is how you will save money." Be prepared to justify savings. Showing how to replace people is ideal. Start with companies that you don't expect to sell to. Use them as practice before going where you don't want to screw up.

That was general advice. Now to answer your actual question.

Companies compete by specializing. Superficially similar companies focus on what they do better than others, and so no two look alike. This makes identifying common needs hard, and the more it is integrated into how they work, the harder it becomes. Also companies have to get past the free rider problem. You also face both issues. Changes that one customer wants will make it worse for another. There will be customers who look at what you have, copy the specs, then write their version in house.

Good luck. If this flops, then this too was practice. The lesson is to get feedback before developing. If you can keep getting up and learn each time, you will succeed eventually.