So if 10 customers can't pay your costs, could 20? Could 30?
I would focus on getting to the number of customers that can make the business break even, then quit (as it seems you're a little hesitant to jump in right now)
[from here on, I'm assuming the SaaS is related to VetWork]
If you can't quit your day job b/c of financial reasons, have you thought about outsourcing the marketing work to get more customers so you can be profitable?
Or, if outsourcing the marketing work isn't a good fit, have you tried advertising? I'm not sure if that will be a good fit, a quick google search finds the ad marketplace pretty crowded, and your ROI on advertising would be low.
Do your customers love your product? How can you give them incentive them to recommend VetWork to other vets? Or, how can VetWork increase the amount of work that they (the Vets) get?