Niche influencers rocking !
An important thing to remember is that when you turn to opinion leaders who specialize in a certain content- the target will usually be more accurate, this is because the followers of those influencers are also interested in the same areas in which the influencer is interested.
Many business owners are simply unable to be consistent over time... So they work on something and if on the first hit it doesn't become the next big thing, they despair.
Ensure that the advertisers' core values fit the influencers' relevant core values for a long-term partnership that generates income and pays users.