I do not know if I would consider myself under depression, but I wake up each day to a job I do not like at all and I come home feeling ruined at the end of the day pretty much every day - but my advice would be..
Uphold a regular sleep routine (I was previously only getting 6 or under hours sleep per night), when I changed I was feeling a lot better, although it cut more of my free time out - but I was having to sleep half the weekend to make up for it - but now just change so you go to bed earlier during the weekdays and get up early on the weekend since you do not need to compensate for sleep).
Uphold regular exercise - this is a must, even just get outside with a skipping rope and do 5 mins a day in the morning or when you get home. Working towards something physical with the body is a big need.
Take up something in the form of creativity that allows you self-expression. Writing in a lot of cases where you can put your thoughts down into words will help you a lot and it is a rewarding task to see what you can do with self-expression.
Try to remove or change negative influences in your life, maybe it is the music you are listening to, something you are watching on TV.. and replace them with positive ones.
I find dressing in brighter colours always helps as well, I typically had a habit of dressing in near or pure black. Mixing up a change with clothing is always nice as well.
Most of all, keep reminding yourself you are not always going to be in this situation and that it is only a temporary thing that you are going to overcome and beat