Understanding triggers?

Hey! I'm quite "new" into my autoimmune as it's been only around a year since I got my first flare up and around 8 months since I've been diagnosed. Although I have mostly lupus symptoms, I didn't test positive for it. Instead, I was diagnosed with UTCD - which, for me, it makes it harder to understand possible triggers since it's a quite complex and broad diagnosis. Also, I don't quite understand yet what are some of my symptoms exactly because I dont know what to look out for since it's so broad. How did you find out what are your triggers? And how to connect them with possible symptoms considering they sometimes show up days later?