If you want to thrive you should focus only on what you can control and never try to control what you can't because it will only make your life miserable. It will only make you worried and became a big fan of procrastination. You will build a lot of "WHAT IF's" in your mind. What if it didn't work? what if I suck? what if he didn't deliver? what if something goes wrong? and endless what if's that will only make you insane. You cannot think properly, you will have sleepless nights and your goals will fail.
Just focus on what you can control, if you are a struggling athlete who is just recovering from an injury, all you can do is become healthier everyday, all you can do is recover the strength that was lost in your body. You cannot force everyone to believe that you are 100 percent healed, you cannot force the teams to hire you again, you cannot force every coach to believe in you again. Those things are out of your control, you cannot control what they perceived in you, you cannot control what they think of you. All you can do is become better everyday, take it one step at a time and climb your way back on top. You can only control yourself, your behavior and your attitude. You cannot control the outcome.
If you are struggling in making money just try to control what you can control either. If you are in a sales business never force people to buy your products or argue with them or make them involuntarily patronize your product, just focus on making a good sales presentation and if they didn't buy your products don't be angry just focus on dealing with other potential buyers or clients. Never hold a grudge on someone just because he didn't gave you a favor. Focus on improving your business strategy because that is all you can control. Anything that is not part of yourself shouldn't be controlled.
If you focus on what you can control and be better at it then you can control people and situation in the end because they will voluntarily follow you. They will see that you are in control of the situation and they will be willing to be controlled. The will feel that you are good in what you are doing, you are confident and you can carry them to success. You don't have to force everything to follow you, they will follow you if you are deserving. You don't have to worry because once you controlled your mind and attitude then everything else will fall in its designated place.