I think that a thing that is very important when suffering from depression is to keep in touch with friends. When feeling depressed we often feel like isolating ourselves and withdrawing from others. However, many studies have shown that social contacts are one of the most important factors for happiness.
Other than that I would recommend you to focus on the basics: Exercise, eat healthy, and try to get enough sleep.
Think about what activities you enjoy doing and deliberately make time for them.
Lastly, and most importantly, consider seeing a therapist. Psychotherapy can be very effective with depression and some people really benefit from antidepressants.
I hope this helps somewhat. If you have any questions or want to share your experience in more detail, feel free to message me.