There are many ways to get to 100% completed profile, but some items are required. To reach the initial 60% you’ll need a photo, title, overview, and at least one entry each for education, employment history, and skill tags. Please check this help article.
Please read this help article to find out how to Find Work and how to submit proposals for jobs that you find to suit your skills and experience. Make sure you check resources in this post to help you get started.