Nice challenge. Thoughts:
1. Templates
People searching for "VC pitch deck template" or "sales proposal template" are higher-intent than people seeing an ad, because they're already mid-task. Publish 10-15 genuinely great, vertical-specific templates and distribute them where deck-makers already look.
2. viral loops
Something like a subtle "made with [product]" link on exported decks
3. Commenting on threads in communities
This usually converts better than generic outreach because you're solving the exact problem someone just asked about in a chat/post.
As for metrics, pick a north star in advance, see if it moves the needle in the right direction.
