As a b2c product marketer, how best move into SAAS industry/b2b?

You already are a marketer, which is a good starting point.

Key differences: 

• In B2C, you are focused on users. In B2B, you also need to think about accounts: That means you are moving from a “a buyer” to “ a committee of buyers” for your product. That means additional personas, objections, processes and challenge. 
• In B2C, marketing could directly result in revenue. In B2B, you will have a sophisticated sales team to generate revenue. 
• In B2C, sales cycles can be short. In B2B, they typically tend to be long
• In B2C, there is a lot of focus on engaging content. In B2B, the focus is on educational content
• .... and more
  
  1) So, first acknowledge these differences and see if you can bridge that gap with projects
  
  Example: if you are a B2B2C company, which is what most companies are becoming, then try to work on some B2B projects - like messaging or pricing for resellers
  
  2) Find common ground and transferable skills - Did you do customer marketing or content marketing or channel/partner marketing? Those are all valuable skills in B2B as well.
  
  3) Think if there is some intermediate role that you might need to take before becoming a product marketer at a B2B company - examples: Marketing Ops or Growth Marketing - Get into B2B industry first and then get into product marketing.

People often say that you can get into organizations by either function or domain. If you haven’t been in SaaS before, get into a SaaS company through your functional expertise - product marketing.

I would recommend moving into a SaaS company that does both B2C and B2B. You have the product marketing functional expertise to land in B2C there, and then you can network and move into a B2B function from there.