What are the top 3 things that will provide value to C-Suites as a product marketer?

The answer to this can be quite subjective. I only mean that in what matters to these leaders might not matter to others and so on. The key is to listen and understand what is the most important elements for YOUR leaders and align your strengths to those. It doesn't mean pretending or even discounting what you might feel is more important, but more so showing value that is aligned to what THEY find important. Product Marketing is an amazing function because it covers so much ground so it's not hard to find areas to lean in to that the C Suite will care about. Once they understand your role in contributing to those key priorities, you will have a seat at the table and be able to expand on those contributions (and even in to areas the business might not yet understand is valuable!)