In your opinion, what's the most important quality of a successful startup?

Focus. There are many startups that lose focus on the core product and market within the first few months to year, leading to failure. Saying no to quick viral attention and maintaining a clear vision and strategy helps them steer a consistent ship.

the quality of be successful I think is be a good leader show example to people who you are

Velocity of learning – how quickly you're learning from your experiments and building on them.

Advertising and the product itself.

Diligence

Product Quality - Visibility and a solid revenue strategy.

Figuring out real problems and actually solving them. Making a good connection with your target audience and gathering constructive feedback.

The ability to stay focused