You can definitely become a happier person with the help of mindfulness, but even without it, you can enhance your ability to remain joyful (on your own) by becoming more grateful, patient and compassionate. Whenever you feel you are drifting towards sadness or you are stuck in a negative mindset, distract yourself. Get out of that zone immediately. Some people use music to distract themselves while others prefer to read their favorite books or go for walks. Eat your favorite food to enhance your mood or talk to a loved one.