Maybe the real question, why do you want to do thise things? Because games and movies don't matter that much, really. Nor do books, really.
You dont need to force it. Try something else. Try different hobbies to spend time with.
And also, old games are not as good as nostalgia has us remember. Maybe you are alt tabbing, because the books you ate picking, movies you watch were good for past you. And now your interests changed and they don't fit you, actually.
You make a good point, and I think there is fear in that the hobbies that we used to enjoy get replaced by something less substantive, even less “productive” - scrolling for endless content, engaging in short-term meaningless comment threads like this, consuming information that the brain forgets within hours.
You dont need to force it. Try something else. Try different hobbies to spend time with.
And also, old games are not as good as nostalgia has us remember. Maybe you are alt tabbing, because the books you ate picking, movies you watch were good for past you. And now your interests changed and they don't fit you, actually.
You may just need to change genre.