If you're trying to make a pivot into product marketing, what advice do you have for highlighting transferrable skills and addressing gaps?

It sounds like you already have a lot of the relevant experiences to make your first jump into product marketing. We actually have someone on the product marketing team who started in the same way - partner marketing. She leveraged her experience on the partner side to build on product marketing. From launches, to building go-to-market materials with joint value props, etc. But at the end of the day, it's all about the team your interviewing with - what gaps do they have on the PMM team right now? Do you have experience in those areas that you can help them fill? I would start by focusing there and seeing what transferrable skills you have that match. 

To be completely honest, based on your description, you sound like you have a very close skill set and a lot of the right experience already. I would probably want to speak with you further to understand your depth of involvement and practical abilities.

The one piece of advice I will give is the same one I continue to harp on throughout this entire AMA - prove to me the outcomes you delivered. What was your goal and how did you make progress towards it?