I took a lot of us here a month until we received the second mail asking us to be patient. Again, they must have so many apps. They do seem to prefer low hours. I read about a lot of guys who were rejected with experience.
German is technically only desirable. From what I see on social media etc., most people are German or German speaking, but not all. Don't know honestly. I am also not German but live in Germany now and speak B1/B2.