People we spend the most time with, add up to who we become.
There are people who are less advanced in their personal and professional life, and there are people that are more advanced than us. If you spend time with the people are behind you, your average will go down, and with it, your success.
But if you spend time with people more advanced than you, no matter how challenging that might be, you will be more successful.
Take a look at around yourself, and see if you need to make any changes.