If you have the time and are wiling to put in some effort, I would write a book in the domain you are doing your freelancing in and self publish it(you could even try ghost writers if you want to burn the $$$ and save yourself some time) Then spend the rest of the money on marketing the book. This could bring in some income and also act as a promotional tool for you. 3k isn't a huge amount of money to do this though.