I have an aunt who suffers from the same level of depression. Continue to work closely with your psychiatrist, clinical psychologist, and the rest of your care team, giving them timely feedback about what medications are working (or not) and how you can tell they’re not working. Ask your psychiatrist about TMS (Transcranial Magnetic Stimulation), a therapy for treatment-resistant major depressive disorder. Most importantly, don’t give up on yourself.
Continue to attend group and individual therapy sessions to discuss your feelings, build social and coping skills, and maintain social contact. Ask your psychologist about helping you to develop a plan to strengthen and broaden your social support network, your contact with other people. It’s important to get up, get bathed and dressed, and have someplace to go every day where people are counting on you to be there -- whether that’s somewhere you volunteer, work, exercise, or engage in a hobby or sponsored group activity. It’s important to be needed and to stay active and involved. Do this for yourself.
I wish there were a magic fix, but the truth is that your solution will require hard work, cooperation with your care providers, and patience. The results, however, will be worthwhile once that dark cloud lifts.