To increase your chanses to find assignments, you have to have an updated and thoroughly filled out profile. Remember that it is your profile that the client has as a basis when choosing whether to hire you or not.
Highlight past experiences and competencies and be specific in what your skills are (language, office package, systems, training etc.)
Be personal by, for example, mentioning your hobby or another passion that makes you unique.
Use the video presentation to set a good feeling about yourself. Profiles with video presentations recieve more job opportunities.
Also, remember to keep your profile updated as you learn new things or develop new interests or skills.