As a Product Marketing professional, if you feel like you are doing a lot but not seeing results, it might be due to a pitfall that you are stuck in. It is important to be aware of the pitfalls so that you get out of one that you are stuck in or think ahead and avoid them entirely.
Something that I found very useful are Battle Cards for sales teams. Battle Cards provides handy information that a sales team can use against competition when talking to clients. These are slightly larger than flash cards, but still up to just 1 page long that can be pinned up on the desk or taken along.