If you're ready to make some major changes your course, one way to start is by switching to an OER textbook.
Here are some sites that contain entire textbooks in a variety of fields:
If you need more textbooks in your discipline, check out our OER by Discipline page.
Are you even more ambitious? If you're trying to overhaul your entire course, consider using an OER course as a starting point. Since OER is modifiable and remixable, you can take the course structure from any of these sites and reorder it, or switch out lessons/weeks for different content.