Actively express thankfulness.
According to one study, couples that expressed gratitude in their interactions with each other resulted in increases in relationship connection and satisfaction the next day--both for the person expressing thankfulness and (no big surprise) for the person receiving it. (In fact, the authors of the study said gratitude was like a "booster shot" for relationships.)
Of course the same is true at work. Express gratitude for employee's hard work and you both feel better about yourselves.
Another easy method is to write down a few things you are grateful for every night. One study showed people who wrote down 5 things they were thankful for once a week were 25 percent happier after ten weeks; in effect they dramatically increased their happiness set-point.
Happy people focus on what they have, not on what they don't have. It's motivating to want more in your career, relationships, bank account, etc. but thinking about what you already have, and expressing gratitude for it, will make you a lot happier.
And will remind you that even if you still have huge dreams you have already accomplished a lot--and should feel genuinely proud.
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