Studies after studies have found that people who focus on too many things at a time usually fail at most of those.
Our brain is a very busy centre of activities. Obviously, the top priority is usually to keep the body alive. Followed by a hundred other decisions we have to make each day just to get by.
And then, there is this barrage of information that is thrown at us every day. This only makes the situation worse.
Unfortunately, we have limited amount of time and energy. The human brain just cannot afford to focus on too many things at once.
The only solution to being effective is to do reduce the number of things and to do them well. Focus on what is important.
As counter-intuitive as it may sound, you achieve more if you focus on fewer things.
Less is more.