Finding, well that's for you to know because you're in that industry and can see who is considered (one of the ten influencer archetypes) influential. Who are you learning from, who has a dominant voice, who do others pay attention to, who is making news? Becoming your advocate requires a few things. First your offering must be relevant to the expert. Second you need to understand what motivates your expert. Third you need to characterize the value of your expert. And lastly you need to deliver something of value to the expert, repeatedly, in order to earn an exchanged value.
I'll remind you that if you pay for your friends, they have every opportunity to go be someone else's friend when you stop paying. But if you can feed their motivations and deliver value, they will be a lifelong friend you have earned and do not have to pay (money). Sure, you're still paying with time and attention, but you're developing a relationship instead of managing a transaction.
Would love to connect with you to understand your current engagements.
I feel like I have this issue. Being a first time entrepreneur with no direct background in the field (creating a platform to match people's passions with causes and nonprofits), I feel like I have nothing to offer in exchange for advice. It is also hard to find people at the intersection of tech and nonprofit work who do much more than make websites. Opps, not really an answer, but best of luck!