Start looking for new work when your current work is burning you out. You seem to have the opposite of that problem. Keep your current job, and start using you

Start looking for new work when your current work is burning you out. You seem to have the opposite of that problem. Keep your current job, and start using your surplus time more effectively. Take some classes to pick up new skills and résumé candy. Contribute to some open-source project. Find somebody to mentor.