My second massban in my cpa journey

Guys , first time i burned 80 accs after mass ban , now i got mass ban and burned 60 accs. I use 1 acc 1 proxy and i thought I'm safe , but unfortunately. Tell me please , how to find out what caused my mass ban? Before some days I changed profile picture on almost all of my 80 accs . I changed basically all accs on same picture and I did this at the same time , but my all accounts were on different proxies. Can Instagram still give me massban for this? I got 60 accs banned from 80 now..