How can log others/hackers out of my Apple accounts and devices?

Read this document if you think your Apple ID has been compromised. --> If you think your Apple ID has been compromised - Apple Support

For iOS 15 or earlier, if you want to see if anyone else has access to your device or accounts, click here --> Limit access to your iPhone or iPad - Apple Support

For iOS 16 or later see how Safety Check on iPhone works to keep you safe. How Safety Check on iPhone works to keep you safe - Apple Support

Use the information in this document to check your Apple ID device list to find where you're signed in --> Check your Apple ID device list to find where you're signed in - Apple Support

Related materials:

Personal Safety User Guide

Personal Safety User Guide - Apple Support

> open the Table of Contents and review the articles

A document with general information about security and your Apple ID --> Security and your Apple ID - Apple Support

Contact Apple for help with Apple ID account security. This page provides country-specific Apple Support contact information ➞ Contact Apple for support and service - Apple Support

Instructions for iPhone

1. Go to Settings and tap on your profile. Tap on Sign-In & Security and then Change Password.
2. Next, I recommend enabling Two-Factor Authentication which is right below the Change Password option.
3. After you have changed your password and enabled two-factor authentication, go to your profile in the settings again.
4. Scroll to the bottom and remove any unrecognized devices.

Let me know if that fixes your issue.