I'm not sure about that. I was tired of Warhammer. Now I feel that I'm ready to return to WH40k themes, but the problem is that I don't wan to.
Even in terms of pure profit, say, Mass Effect universe is way more profitable. What? You think that I draw my works just for fun and I need no money to pay my bills? So please, no 'You've betrayed your fandom!' crap in comments. Art is business, and artists have to eat every day. So t's no longer the question 'What I'd like to draw', but 'Which theme will get me more clients'. That's the problem. I could return to WH40k, keep drawing funny stuff and have no profit, but I'm fed up wit that. Especially when I see how 13 y.o. girls have tenths of Teen Titans commissions, and Bleach fan artists have no problems with clients too.
So I have a dilemma. And the sad thing about it is that I know which way I'm going to choose.