Congrats on the validation . . . don't think about competing or going big, quickly . . . you can continue to grow your B2B app as planned . . . You can watch learn/innovate based on what they are doing . . . you can also make faster decisions being small . . . I would offer a concierge service to migrate their desktop users to your app . . . maybe create a tool so they can even do it themselves with a click or two . . . sounds like you have a good app idea . . . keep working and growing it as planned.