So I've been working on my second novel for over a year now, and I'm just getting to the point where I'm beginning to redraft... ...and I've just discovered that a book has been released (trad published) in the intervening time that has a VERY similar setting to mine. The book in question is a children's book, whereas mine is very definitely an adult one. The plots and the political situations also seem to be very different - but the general aesthetic and concept are near identical. My "big unique setting" essentially already has another writer releasing books about it. I can't change my setting, since so much of the concept and plot are bound up in the specifics of the setting... ....so exactly how much of a problem is this similarity if I wanted to get my book traditionally published?