It seems like you have managed to move into the coveted market of Enterprise level SaaS, well done.

If your market can sustain a high enough monthly cost to keep using your software then you are set. If so, you have a template for each compnay to follow and also a proven track record to sell from. Now you just need to find more companies and sell them a custom application for their businesses and get them paying a monthly fee for security and support.

Unfortunately, if you are in a market where the businesses cannot afford a $2000/month+ application fee, you may need to step back and rethink where you have ended up.

Let me know if this helps or if you need further assistance.

Thanks.