According to studies, people who are happier also work harder and are better at getting work done. Here are a few ways to make an immediate impact on your work life happiness.
People need to feel like they're influencing something or making something happen that is important in their lives. Whether it's making a difference to someone or changing an outcome, it doesn't matter as long as it is important to the person. Feeling like there is a purpose to your work will make it easier to do.
Making an impact in your workplace is important, but it's not the the only thing that should be. Not only should you see how you're making a difference in your work, you should also see how it is making a difference to you. To feel more successful people need to feel like work is tied to a personal goal of theirs.
Some people will tell you that you shouldn't be friends with others at work because it will interfere with what you're supposed to be doing or that it will change your judgement somehow, but I don't believe that to be true. In the workplace, you need to feel like you have a team that you belong to and you need to be able to show mutual respect towards each other. Being friends helps with this part.