There actually are many things that can de-rail a successful freelance career and perhaps these 5 should have your attention.
The 2 that I think are important to always beware of are:
1. Keeping your eye out for ‘something better’ (such as taking a permanent role)
2. Being too successful and not being able to take on more people
5 Things that Can Derail Your Freelance Career: “There are many things that can turn everything upside down. I wish there were only 5 things that can derail your freelance career but unfortunately there are many more. However, in my humble opinion, these 5 need to be paid special attention to:”
(Via “>Speckyboy Design Magazine.)