Even better , build your own product that will become passive income over time. The goal of a free-lancer should be to be free.
Good freelancers tend to be well paid. Even mediocre freelancers seem to make more money than employees.
Of course it depends on the kind of industry you work in. In art and writing, things seem to be pretty bad. In software development, however, the market is great. In Amsterdam for people with my experience, at least.