Do you know what you're good at from the start? No. You can only eliminate what's obviously not your strength based on past performance, and then assume the rest comes naturally to you.
The process of gradually eliminating areas you're not suited for is the inevitable path to discovering what you're actually good at.
Knowing what you're not good at isn't necessarily discouraging—it's more often a sign of self-awareness.
The goal isn't to avoid losing by staying on the sidelines, but to engage heavily and still come out ahead.
As a business, the top priority must be breaking even. If you can't break even or support yourself, no matter how grand your ideals, it's all castle-building in the air. No matter how highly you regard yourself, in reality, you're on your knees. Profitability is a critical metric for any team—even if it's just one dollar. At least then you can sustain yourself and avoid being forced into a capitulation.
Find a solid foundation where you can at least break even, then increase the number of attempts.
Secure your baseline returns before going after scale.