Well. First off, I am not sure whether this forum is exactly the most suitable place for casino to look for influencers, in my opinion.
Usually those who consider themselves to be influencers spend their active day on other platforms and social media, like Twitter/X or Instagram, at most, here in the forum you could find people to manage your campaign but not a visible gave to make videos and hold streams for you.
I am not an expert in marketing whatsoever, but it would be more productive to reach to people who actively stream their activities in platforms which have not banned gambling from their site yet. I am sure there are people in Instagram who would be interested in an offer from the casino.
Also, they fact you have found some influencer and you do not feel they are trustworhy enough make me speculate on how high your bar is, when comes to standars and the relation between the price of the sponsorship and the quantity of followers that particular influencer has.
Anyways... Good luck with your search.