I would recommend selling more value and not just the technology. What value do you bring to the table for a company to warrant them investing $150/hour for your work?
There are others with possibly more completed projects, clients, time under their belt with more developers, if they are a company, what value do you offer that they cannot provide for less?
Go for bigger clients with bigger budgets, government projects would be a good place to start. Just make sure you have your business setup correctly along with a website, list of services and value you are providing using Django and that you meet a companies prerequisites (Incorporated, LLC, insured, mailing address, phone number, business bank account, etc.).
Ask yourself what value can you bring to the company that will make them want to pay you the higher rate. Once you answer that question and can back it up you will get the rates you are looking for.