I've found three core customer sets that helped us define a sustainable business:

(1) government agencies (which tend to put most expenditure under labor categories, so they hire a lot of long-term consultants and contractors)

(2) mid-to-small sized non-technology firms that want better data science strategy or want to build data-driven features into applications/products (especially in novel ways)

(3) smaller technology companies that don't have the MLE and data management system capabilities.

My career has been in heavily regulated industries, so our customers often have an appreciation for the management and governance portion after experiencing negative data science outcomes from maverick types.