Oh absolutely, @MrsTerryPratchett, there are plenty of well informed and intelligent women on MN who could help OP with study suggestions. Whether they should or whether that is cheating is another matter 😂But OP isn't asking for help with research with secondary research ie asking for pointers to research that has already been done. She says she is conducting primary research ie collecting original data on the subject.
I'm not sure what useful data OP can gather on the subject of whether nature or nurture have the greatest influence on serial killers by asking the opinion of strangers on the internet, especially as she hasn't asked for any information about responders. I could go out on the street and ask people whether they think leeks can cure cancer but what would analysing that data tell me about whether leeks can cure cancer?
I don't think OP is going to be able to gather any useful data on here that supports her argument. At least, not with the question she has posed. TBH, I'm not sure that her essay is one that lends itself to primary research for an epq as she would need to gather data from serial killers or people who work with serial killers to be able to learn/conclude anything meaningful.
I have a feeling that OP's teacher may have told the class that MN is a useful site for conducting primary research rather than advising OP that it would be a good place for research on her subject.
I don't think primary research is compulsory for the epq. Maybe OP needs to discuss this further with her teacher. If it isn't compulsory, it would be far worse to include irrelevant research/data purely for the sake of doing primary research.