One thing I've found useful, in addition to drinking lots of water and vaping my head off.. is using a Neti Pot. I was always turned off by the idea of water running through my nostrils, but once I used it, I was really surprised. It keeps my sinuses clear, stops nose bleeds, and helps keep the natural balance of things. They're pretty cheap and you can find them near the Afrin in any pharmacy... My boyfriend has used one for years (he's had sinus surgeries), and I finally made the leap when a Doctor coworker of mine told me he has chronic sinus issues and uses one everyday as preventative maintenance. As someone who can get upwards of 3 sinus infections in the winter, I appreciate not having to deal with that nastiness.
Best of luck!