Siri Learns
Siri Suggestions is a feature that helps enhance your experience by providing intelligent recommendations and shortcuts. It learns from your actions and app usage, gradually understanding your preferences and routines. The list of suggestions will automatically populate based on the apps you use, the times you typically use them, and your interactions with your device.
For example, if you often message a particular contact in the morning, Siri might suggest sending a message to them around that time. If you frequently listen to a specific playlist or podcast on your commute, Siri will offer that suggestion when you're typically heading out. Similarly, Siri can offer suggestions for actions like opening apps, setting reminders, or using shortcuts based on your behavior over time.
These suggestions are personalized, meaning they adapt to your habits and can change based on the context of your day, helping you save time and stay organized without having to manually search for apps or tasks. You can access Siri Suggestions from the lock screen, the search bar, and even in the "Siri & Search" settings, where you can customize how and when they appear.

Make Siri Forget.
To unlearn or reset Siri Suggestions, the only way to completely clear Siri's memory of your past actions is to restore your device from an old backup. This process essentially reverts your device to a previous state, including your app usage, preferences, and habits that Siri has learned.
When Siri Suggestions learn from your behavior, they collect data about the apps you use, the contacts you interact with, and the routines you follow. While you can disable or limit Siri Suggestions in the settings, they will not be fully reset unless you restore the device. This means the suggestions will still be based on your current usage, even if you turn them off.
If you wish to clear this learning history, restoring from an old backup—preferably one before Siri started learning or making suggestions—will remove all the stored data. However, be aware that restoring a backup will also revert your device’s settings, apps, and data to that previous state, which could result in the loss of more recent data.