I have been through the same struggle with my co-founder last year... My main advice to people who leave their job to start working with a co-founder without a

I have been through the same struggle with my co-founder last year... My main advice to people who leave their job to start working with a co-founder without an idea AND without a clear verticals they want to focus on...is not to do it. Time constraints (when you are brainstorming as a side job) and outside dynamics (being in the middle of real everyday life) can help you so much be more creative and drive toward a decision. Then, once you have committed to something, you jump chip and start working on it full time if you can afford it.