In life you often want to do everything under the sun. Your mind is limitless, however there is only so much time, so many breaths, so much attention that you can give out to different things in life before you get spread to thin and then cracks start showing up in your life!
How do you decide where to spend your time, your efforts, who you spend it with? and also whether you are being manipulated!
Well I would say remove toxic people from your life to start with, sometimes you can't always remove them, but then limit your time with them as far as possible.
Then surround yourself with people who make you a better person, those that will teach or mentor you without seeking anything in return except maybe friendship.
The structure your time to get the basics in: healthy, relaxation, sleep, nutrition and spirituality. Your best performance at anything including work will be determined by having all of these in place!