Tongue-in cheek: just give relationships your best go, you'll become all aromantic soon enough.

OK, now I'm serious: try some romances while paying close attention to how your instincts manipulate your motivation system. Notice all biases that appear. Use your usual debiasing methods. Done.

I think I did more or less the above, and now I have a reverse problem: I do not know how to become romantic again, while staying unbiased.