Always keep in mind the status of your portfolio when starting new work. It is best to have a good balance between confidential projects and consciously choosing some projects that you will be able to integrate in your portfolio on the short term. Also for the news value of your own name and business you need projects you can communicate to people around you. Mass manufactured products in liaison with large corporations in my experience take longest to come to market. So balance it with smaller projects for smaller businesses. You can design for Kickstarter startups and gain very early exposure on high news-value projects. Even for some complex products like drones and innovative vehicles there is often no NDA required since the company relies on early exposure for building a customer base and brand value.