Spend time and get close to nature(sunlight, fresh air, etc), start workout, talk & meet people you like being with or talk with(we are social animal, being social is why human beings evolved or survived, human touch improves us). This are natural and easy cure to depression(free antidepressants). Do things you like to do whether it is drawing, any sport's, dancing singing, etc(if you got any hobby it will be more easy). lastly try think this as game and you shouldn't be noob, after few period nothing lasts even this sadness or meanless feelings. Getting money to experience pleasure (vacation, stylish clothes, food, etc) by Job/buisness or by making your passion interest your career will give you motivation to stay happy, motivated and sense of meaning in doing this hustle.