You have limited resources, time and energy. By knowing your strengths and weaknesses, you can use those wisely by leveraging your own strengths and by outsourcing, hiring and partnering with those who have strengths in other areas.
List your top 5 strengths, and top 5 weaknesses. Then find five people (preferably past colleagues) who know you well and ask them for the same list. See if they think similarly and whether you should update your list.
Relate your strengths and weaknesses to your business idea to understand your position within the company. Find capable colleagues and partners to compensate for your weaknesses, and you’ll have a sturdy foundation for your new company.