The most important thing about your creativity is the way you present it. You should always be confident enough to showcase own your ideas. If you think that your idea is not the perfect one but you present it with enough confidence, clients will have to think twice before discarding it. People generally appreciate your creative ideas if they are presented with a confidence in your attitude.The approach you carry for your work is the most aspect for your creativity. No matter how hard you work for your creative idea if it is not presented in a confident manner. Sometimes two ideas can be equally good but can be distinguished on the bases of their presentation. Try and bring a positive approach at your work so that your mind can come up with some great innovative ideas.
For a freelancer a boring routine can be the major reason for your creativity blockage. So it is always better to get out of your regular system and break the routine. The same and rigid routine can get very annoying so if you want to stay creative, you need to break the routine and take a break on and off.
Your body is not the only thing that needs exercise, even your brain needs exercising too. With long working hours and hectic working schedule your mind can get overwhelmed and thus blocking the flow of creative ideas in your brain. Try and take some quality breaks from work which can keep your brain to stay active for work.