All VC backed startups are default dead. It's terrible phrasing. You're basically asking if you should stay at your default dead startup or be at another default dead startup.

Another irrelevant data point is how long you have failed to make revenue. We see patterns of startups building things for 4 years, then hit product-market fit 2 years after launch. You have the runway for that, and you've already put in the time. However, there are startups that start from scratch, launch a thing in 4 months then get to PMF 2 months later. You rarely see data where someone launches something 4 months and sees PMF 4 years later. Starting from scratch isn't bad.

It sounds like the problem is with your cofounder and the processes that led you to this point. So based on the given data, I'd say do something else.