There are no easy methods of learning difficult things; the method is to close your door, give out that you are not at home, and work!
Joseph de Maistre
I like this quote because it idealizes keeping external diversion away from yourselves. Just think about it: You want to learn a song on the guitar. So you take 2 hours of your time every day, when you shut down your computer, pulll out your phone, close your door and pretend you are not at home. You are just not available to others at that time of the day, because you commit yourselve to playing guitar with 100% of your attention. You are 100% present, physically and psychically!
That is how you really improve, but of course it is a very drastic way and just an idealization. Try and find the right amount for you personally.