Could you give more of an idea about how much it "took off"? Based on earlier comments of yours, it seems that you have some paying customers. Has it grown very gradually? Do you have much churn?
Also curious how you have been splitting your time between algorithm development for the underlying optimisation problem (probably the most interesting part to me!), AI front-end (a neat value-add on top), marketing and dealing with support? If you have the time and energy, I'm sure a blog post or similar would be interesting to many people.