Hi Suzan. You can definitely get back into writing after a hiatus. What did you learn during your time away? You could write about that, or anything you're passionate about! Books, movies, tips for your job, anything and everything you can imagine.
Alternatively, go back and refine older material. I can tell my progress as a writer when I go back and edit my original work, and it's gratifying to see how far I've come. Good luck!