The definition of focus by dictionary.com is “to concentrate”
Every time we are interrupted, it takes away from our focus.
Every time we have to switch tasks we lose focus.
The best way to create focus is to reduce what we are focusing on down to one thing. With one thing we can put our full focus on it.
The process of going through everything we are doing and figuring out what can be removed is a difficult process. The time it takes to reduce what we choose to focus on is worth it as it will increase focus.