Awesome, you gave the whole scientific aspect to the happiness and i will not go deep into the scientific aspects but in my opinion happiness comes from our environment means if you keep your environment good then automatically our mood gets refresh and joyful for example, people when feel boredom they listen music or do some activities and the music creates an environment in your mind which gives happiness, so try to change environment means if you feel negativity then try to change your environment and try to move somewhere else for some time because that will change your mood. Thanks for sharing and wishing you an great day. Stay blessed. 🙂