Guys, I just realized that I don't have any specific niche. I was just randomly switching niche without sticking to one can you help me to find right niche for me or how you found right niche for your self

Just tell me what are swipe files and what emails should I put inside it?

I am going to be short on time for next few months due to exams but I can commit 4 hrs per day learning copywriting so, how should I be spending my 4hr of copywriting work? and no I and not going to be outreaching until I get decent in copy 4hr just learning and improving my skills

give me a list of good copywriter's newsletters you guys are subscribed to so, I can have more emails to read and analysis per day

I was thinking to start reading books about copywriting what books should I read first.