Keep working on it. You have an advantage of being able to address the weakness of your competitor. In fact I started my SaaS business, Cronitor, because I was

Keep working on it. You have an advantage of being able to address the weakness of your competitor. In fact I started my SaaS business, Cronitor, because I was unhappy with the incumbent. If you'll excuse the cliche: pioneers take the arrows, settlers take the land. Finally, six months of hard work and nothing is shipped? This is your answer to #4. Ship early and often. Six months is an incredible investment without feedback from users.