Set limits on your screen time. Most devices have built-in features that allow you to set limits on how much time you spend on them. For example, on an iPhone, you can go to Settings > Screen Time > App Limits.
Use a parental control app. Parental control apps allow you to manage your child's device usage, including setting limits on the amount of time they can spend on certain apps or websites. Some popular parental control apps include Norton Family, Qustodio, and Screen Time.
Talk to your child about responsible device use. It's important to talk to your child about the importance of responsible device use and to set clear expectations about how they're allowed to use their devices. This could include discussing topics such as cyberbullying, online privacy, and the dangers of excessive screen time.