Email marketing consultant needed to help with existing campaign

We are looking for an expert email marketing consultant who has extensive experience in SAAS email marketing. We use instantly.ai for our emails campaigns and send approx. 150k email per months. The freelancer must have extensive experience using instantly.ai email marketing software.
Our campaigns are already live, and we are looking to improve the performance of the campaigns. Our target audience is in the USA and prefer a freelancer based in the USA.
The freelance must have extensive email marketing experience that they can demonstrate in a SAAS business.
This is an ongoing opportunity for the right freelancer.