how can I properly invoke a google cloud function inside another function

Question

I am trying to invoke a function (http triggered) in a function as follows:

exports.myFunction = async (req, res) => {
   rp(settings); //request-promise library; calling myFunction
   await new Promise((resolve) => setTimeout(resolve, 5000));
   res.send()
}

I feel this is not a good approach, my considerations are:

• I am not waiting for rp to complete because I do not need the response from it.
• I am awaiting 5 seconds in order to insure the request was fired.

is there a better approach?