Focus on your co-founder only. See what you can do so he can successfully transition to the new pivot. See if anyone in the company or market would be willing

Focus on your co-founder only. See what you can do so he can successfully transition to the new pivot. See if anyone in the company or market would be willing to step in for your role. Discuss the possibility of you raising a new round, staying six months, and leaving. Also evaluate the legal situation when you leave. Despite the fact you've invested your time and money in the company, it still haven't found PMF or anything, so try to give equity away, it will make it easier for you to jump ship and move ahead.