What to do if my Apple Account is compromised?

Without any information as far as what you are experiencing or how it happened, then follow the steps here:

If you think your Apple Account has been compromised - Apple Support

P.S. NEVER post your email address as that is the exact reason why you would receive a phishing message and could possibly give your personal/financial information to a bad actor. Luckily there are others here looking out for your safety and have redacted the email address.

Recognize and avoid social engineering schemes including phishing messages, phony support calls, and other scams - Apple Support

You might also find further useful info and guidance in this document:

Personal Safety User Guide - Apple Support