My iPhone and Apple ID were hacked, what can I do?

Everything I have was hacked or compromised is some way. Apple ID, emails, social media. I believe someone is still able to either read my messages or hear my phone calls. I have an iPhone XR. As far as I know it is not jailbroke. But there is someone that knows more than they should. And no other way for this person to know things. Does anyone have any advice?

[Re-titled by Moderator]