Just to add to this, i think rather than restricting screen time, encouraging non-screen time activities is probably a more positive approach. Denying kids anything that they want to do, just makes them want it more, that's kids. But to help them explore other activities is more beneficial (IMHO). I have always given my kids the opportunity to try anything (within reason) that they have wanted to do, have supported them in these activities and have never forced them to continue, if they no longer wish to pursue them. As it is my 15 year old daughter figure skates, does ballroom dancing, plays the flute, attends a monthly gaming (non electronic) gaming club and goes to youth club on a Friday night. My 16 year old learned Japanese on her own (she took her GCSE a year early, has just finished her DofE Bronze, runs a Japanese club at school and is a keen artist (who has exhibited locally) and she likes baking. All of these things we support because it lets them find out who they are, what they enjoy and lets them develop. They also play games on their laptops, PS4, their phones, but we have never restricted their screen time, we just encouraged them to explore other activities.
My 16 year suffers with anxiety, so crowded places and large group activities are uncomfortable for her. Letting my children choose what activities suited their personalities was important and letting them stop was important too, but we always discussed why they wanted to stop, without chastisement or forcing them to continue.
Too many parents try and live vicariously through their children, making them continue with music lessons etc only for their kids to grow up detesting those instruments and losing all of the pleasure that they should have gained.