What are the most important sources of customer feedback for you to prioritize your roadmap?

The following sources of feedback are very important to me and my team: 

Customers our PM team is directly in contact with, as well as our direct digital feedback channels in the application

Sales Teams - why do we lose deals, and why are we winning deals? Who is asking for what, and what is the context of the account (Rev, Use Case, Engagement, etc)

Customer Success - What are current customers asking for help with? What are they frustrated by? What are they pushing for?

Market Research - we keep a pulse on what our customers are feeling toward our competition, what our competitor's customers are feeling towards us, and many other examples like this that help us prioritize our roadmap.

Usage data - if product areas are not being engaged with, we can make the decision to disinvest in that particular product area.