Having new experiences, trying new things and going new places all play a role in your happiness. Your brain craves variety; new and exciting stimuli. If your life is stuck in a rut, with little to no variety, it's going to be tremendously hard to feel happy. I've found that the easiest way to conquer this is to do just one new thing each day. It could be walking to work instead of driving, switching up what you eat for breakfast or doing one thing you wouldn't normally do. A little bit of variety can go a long way.