I need help with my paragraph

I need some help with my paragraph. I have problems with grammar also I don't know if this paragraph is good enough. Are topic sentence, examples and concluding sentence ok? If there is someone who wants to help me I will be very thankful.

There are several reasons why famous people's career go downhill.
First of all, one of the main reasons is drug addiction. Drugs can strongly affect the career of famous people. For example, a movie star who is addicted cannot work efficiently without drugs or sometimes they can not even get up to work. They can not think properly what can affect their acting skills and because of that, they can lose work orders. Another reason is being too arrogant. Famous people who think they are the best will not accept any criticism from anybody. Even when they do something wrong they will never accept that they made a mistake and it will be very unpleasant and difficult to work with them. Lastly, another reason why famous people career go downhill is the pressure from society. Famous people often want to prove that they are worth to be called famous. They will spend a lot of money to buy exclusive cars, huge expensive houses, clothes from prestigious shops or to travel all around the world. This may cause money debt or even bankruptcy and may end their career. To sum up, three main reasons why famous people's career go downhill are drug addiction, arrogance and pressure from society.