it's allmost impossible to get any success you need be connected with large network of people.
Success is not by crowd, you may be connected to only few people with a powerful information that a thousand people doesn't have, and you may succeed due to that information, because information is power.
That's why it's not good to say i do it all alone because nobody cant really do it alone we need others either we admit that or not.
Thats why we say "we rise by lifting others" But
note, a person may also not succeed because he refuses to be lifted. because of limitations. Some people no matter how hard you try to lift them they may not succeed because the lack focus and self motivation.