have more arrows in the/(one's) quiver

To have several available options or alternatives at one's disposal. This is just the first step in trying to bring her fever down. Don't worry, I have more arrows in the quiver if the ibuprofen doesn't help. I've got a job interview next week, but I'm still sending out my résumé so that I'll have more arrows in my quiver if need be. Yeah, my hours were cut back at the office, but I have more arrows in my quiver—I also studied graphic design in college and can do freelance work.