It can be difficult when you know you are unhappy but aren't sure what to do about it. Sometimes it can be seemingly small things that make us unhappy such as not having quality time with a significant other or constant small stressors making it hard to enjoy life.
Try changing something small rather than trying to change several things or making major changes. For example, setting up a weekly coffee date with friends or establishing a date-night with your spouse to get some quality time.