We get bounce rate when page is not relevant to user need. so it is very simple just keep your page content or products relevant to theme of your website and provides the information which you promised in meta tags.
first off all decrease your page load time, add some high quality content with lots of information about your site or services, attractive images, good navigation system these are the best way to decrease your bounce rate.
Bounce rate can depend on type of traffic on your website. If your traffic is untargeted then you will probably get a high bounce rate from these visitors. so check your Google analytic tool and see the traffic area. Make some attractive web design, promotion page on your website will help to decrease your bounce rate.