So this whole drama is about profitability and a friendship on the rocks? First off, don't go into a business with a friend if you want to keep them as a friend. Second, at least try to fix the profitability problem before selling out or you go out of business anyway. I don't understand this limping along and lack of interest in doing anything at all. Put up a go fund me if cash is the problem, ask people with experience for help as volunteers if it is a tech thing, there is a whole community in the dark about this and many are willing to help.
A trail goes two ways and looks different in each direction - There is no such thing as a timid woodland creature - Whatever does not kill you leaves you a survivor - Jesus is NOT a bad word - MSB