What are your insights into validation and product-market-fit for new apps in Marketplace?

Hello, fellow community

What is the validation process that you apply (or have already applied) to validate if an app you launched on the marketplace should continue to receive investment (of time, budget, workforce, etc…)?

What do you consider as the metric and target to say - “Hey, this is something we need to keep investing our time and energy”?

E.g - After launching the first release, we need to have Y active instances in the next X months…

I know this can vary greatly depending on the context, but either way, any idea, feedback, insight into these issues is more than welcome.