As the CMO of the product, product marketing should take the lead and make sure the teams are aligned. This may require you to set up a meeting with Product Management (and perhaps other leaders across the busienss) to discuss the shifting priorities and align on a path forward. Map out the impact on the business, clearly articulate the challenges and come into the meeting with proposed alternatives and suggestions to spur the conversation.
Ideally, it's a combination of the GM, product management and product marketing. The GM would set the overall business goals for the year or quarter including revenue. The PM often drives the product launch adoption and revenue goals for that product. PMM often builds the plan with the metrics to help back into those goals.
The important thing is that if you see a gap, make sure that someone is owning all of these goals, otherwise, it will be meaningless to have launch metrics.
I think you’re asking if it’s behind a pay wall and not just a free product? If that’s the case, you need material (video!) that can act as a demo, people want to see product, not just read about it. Salespeople who can give great demos and free trials are often a really effective a launch tool.