How to gauge my client's sponsorship / shoutout worth?

A good friend, who is a client of mine is an Olympic athlete, he is sponsored by a huge sneaker brand you all heard of and some other brands.

He has 30k or so followers and obviously verified. We are working on our followers soon.

Now the questions:

  • How much we should charge people for various influencer marketing packages?
  • What % of a cut should I get?
  • Should we try to upsell my services too, and give my buddy some commission?

Let me know his “current value” considering he’s an Olympic level athlete and 30k followers at the moment. Then based of that, how much can we increase for every 10k followers he grows?

So many questions!