We have some very successful single-founder companies, such as Instacart. We suggest finding a cofounder not for our benefit, but for your own. Startups are hard, and doing it alone makes it even harder.
pg has said multiple times that a major downfall of a lot of companies is that the two founders have a dispute. What is the major downfall of companies with single founders?
Single founder can work but it's usually not ideal. For one thing, it demonstrates that you can't find or persuade even a single other person interested enough in you and your idea to join up.