Have you ever battled on going depression, and if so how did you defeat it?

I’ll try to make this as non pathetic as possible. I’ve been struggleing with depression for a while. I’m not into the idea of taking anitdepressants though. I’ve tried exercise and a healthier diet but that doesn’t seem to be doing the job. I’d like to just go straight to the source and tackle it that way, but the problem there is I don’t know the direct source of my depression. I’m hoping other peoples testimonies and advice will lead me in the right direction to help me get back to a happy, fulfilling life. I wanna go ahead and say thank you to anyone who responds or takes time to read my problem in advance. You guys are great and can hopefuly give me a hand.