It sounds like you have some validation, which is a huge step in the right direction, but more is always better. One reason is that, if you ask someone if they would like to use/have product XYZ, you will get very different answers and feedback than if you ask, "Would you like to pay $NNN for Product XYZ right now?"
Depending on your product, I might recommend starting to build an audience of people interested in your product. Try to interact with them as soon as possible. Get them interested. Then when you launch, you have a stable of warm leads, champing at the bit to go.
Depending on your product, I might recommend starting to build an audience of people interested in your product. Try to interact with them as soon as possible. Get them interested. Then when you launch, you have a stable of warm leads, champing at the bit to go.