Find your purpose
People across the globe search for their purpose, but very few find it. Luckily, to find happiness, you don't have to uncover your one and only purpose, but just one of many potential purposes. For example, if you have been sitting at home without a sense of what you want to do, just try something. Go down to an animal shelter and sign yourself up to volunteer. While your major purpose on this earth might not be taking care of these animals, it could be your purpose for now - and would definitely be fulfilling.
It is also important to have a purpose in the context of those in your life. Be there for those you love, and they will be there for you in return. This will help you to live a longer, happier, and healthier life.