I developed a unique software that solves a particular problem. There is interest in the product and sales are ok. But when I approached (at least 10) gurus who speak or write about that topic, offering an affiliate link or just for their opinion. Not one responded. So i am thinking that my email must be wrong or there must be is a specific way to approach them.
Provide immediate value, whichever influencer you're looking to work with think as to how your saas can help them do their job better and then deliver it. Allow them to toy with it etc with cordial follow ups and their feedback. (I myself am an influencer and growth hacker)
Best of luck!