Hiring a optimization consultant

Hi,

i run a website with many plugins including heavy ones like, woocommerce, follow-up-emails, events, subscriptions and more.

my website needs to be faster than it is.
can anyone recommend a consultant company that is expert enough to analyze ways to get the most out of the webserver, database and website.

i have dealt with enough “consultants” who were mediocre.

This is a high traffic site with 5,000+ visitors a day.

Thank You
-Eli