Spend 50% of your time on product and 50% on traction.
It helps you build the right product.
- get feedback from early customers
- what features are missing
- which part of the experience are broken
You can think of your initial investment in traction as pouring water into leaky bucket. At first your bucket will be very leaky because your product is not yet a full solution to customer needs and problems. In other words, your product is not as sticky as it could be, and many customers will not want to engage with it yet. As a consequence, much of the money your are spending on traction will leak out of your bucket. If you don't interact with cold customers in this way, then you generally spend time on the wrong things in terms of product development.
Test different traction channels before you launch anything.