Dealing with short attention span

Recently read about something called short attention span and was taken aback by the very evident thing present in my habits and day in day out task that I carried out. Started observing in much more detail about how this is really affecting me and results are not really good. This is probably the root cause of all my unproductiveness. Feels like toddler now. Observations 1. mobile is directly or indirectly the reason behind this (Started reading books in order to overcome). 2. Trying to do multiple things at once eventually leading to doing nothing. You all get the gist. This is nothing strange. So wise people of grapevine how do you overcome this and also how do you reduce your screen time.