How do I battle my deprestion without knowing what triggers it?

Hey, How do I battle my deprestion without knowing what triggers it? I am a 16 yeat old female in highschool with a long history of anxiety, depression and suicidal thoughts. A little bit of back story about me is that my mum had me and my older sister (18f) when she was very young with my very abusive birth father, to put it in perseptive on how much he cares, when i was nine years old I was suicidal and my mum was so desperate she reached out and asked if he knew what to do. He said that he would call her back but he never did. I have been in therapy for most of my life and on multiple different types of meds, I have a really bad depression episodes as of late and i am not sure how to keep going or if i can, wjat should i do?