Instagram influencers for paid promotions?

Hey BHW
I am thinking about doing CPA through buying promotions from big instagram account that has a lot of followers I picked a niche then I started searching for big instagram account related to my niche then I sent PMs to a lot of them like 15 of them but no one has replied to me.
Can you help me with somethoing?
Should I just wait for their replies?
Thanks

try looking for influencer with "paid promotion" on their story feed.
And yes, try wait some days, and after text them again.