Honestly if you write as well as you are in your OP, you'll be fine. Design your website so that there's a small profile of your in the top right or top left w

Honestly if you write as well as you are in your OP, you'll be fine. Design your website so that there's a small profile of your in the top right or top left where you can prime readers that you're a German. It's often frustrating for me to write in Japanese (since I feel that my English is much less stilted), but most readers have had nothing but positive things to say about my style. I imagine you'll feel that your English writing will be stiffer and less fluid than your German, but if the objective of your articles is for you to reach the largest audience with your writing, then English is the way to go. If you want it to be an avenue of expression for you, then German may be more suitable.