How can I control my Apple TV if I don't have the remote?

You can control your Apple TV without the remote by making use of the Apple TV Remote feature embedded within the Control Center on iOS or iPadOS devices. If you own an iPhone, iPad, or iPod touch running iOS 12 or later, you can simply swipe to access the Control Center and tap on the Apple TV Remote icon. The first time you use this feature, you will need to pair your device with the Apple TV by entering a four-digit code that appears on your TV screen. Additionally, if you have lost the physical remote, it is possible to purchase a replacement remote or even use a third-party infrared universal remote that supports Apple TV. Another alternative is to download the Apple TV Remote app from the App Store and connect it to your Apple TV to navigate the interface and control playback.