What are some tips for helping drive product roadmap as a product marketer if you don't have data or customer anecdotes at your disposal?

There are various inputs into the product roadmap that Product Marketing can provide, beyond data and customer anecdotes. Where Product Marketing can be most valuable is in connecting the dots across the various insights to share a point of view and answer the question 'why this matters'. For instance, you can share competitive trends but take the analysis a step further to share 'why this matters'. 

Additional inputs into the product roadmap: 

• Competitive Analysis: Understanding key competitors, including primary competitors, competitors in verticals, and global competitors to understand where competitive advantages and disadvantages across the marketplace. Incorporate win / loss reporting and interviews into the process as well. 
• Market Trends: Analyze market trends to understand macro themes that will have implications on the product, marketplace, geos, verticals, and customers. This will especially be helpful for longer term planning. 
• Prospects: What got you here, won't get you there. It's vital to understand the broader prospect customer base beyond current customers to identify what wants and needs you aren't solving for, but need to in order to have step change growth. 
• Customer Insights: Triangulate across qualitative, quantitative, and behavioral input to shape point of view, especially since not intentionally customers say one thing and do another. For instance, explore behavioral data to understand engagement and adoption trends. Additional inputs to include NPS, win / loss reporting, case volume, and themes, Sales input, social media listening, research results, customer advisory board insights, etc.