Lost to find a topic for my reseach!

I am really LOST. anyone can help me sharing his/her experience would be great.

I am currently a PhD student and I changed my advisor and minor 'research field' after one year of my program. This is a new research field to mine but I have the ability and confident to conduct research and go through but the big problem I've never been exposed to this field before and couldn't find a solid topic/idea to consider for my research. my advisor asks me to find a topic in my own. any tips guys!!