eink, let me try and explain things to you.
The porn industry is like a vegetable market. It has stalls selling every vegetable imaginable.
I have a stall at that vegetable market. I offer a ton of different vegetables. You have a stall at that market, not only do you only sell peppers, you only sell the green ones. So who do you think is going to make a living off of their stall at the market? Me
So in other words, EXPAND. You have one blog, not only do you have one blog, on one subject, it is in German. You are limiting yourself to a very small segment of the online population. When you do that, you limit your profits. The best advice I ever got in adult was "never stop building" and I don't.
Make a second blog, an English version of your German one. When you have that going, make a third blog on a totally different subject and link them and trade links with other blogs.
Make some mainstream blogs and put google adsense on them to bring in some money. Start building and never stop