consider a phd?
in the meanwhile put an effort in learning german.
blindly sending applications is good to show the RAV, but you should look for a target (maybe that works with what you did in master thesis or internships) and write ad hoc motivation letters.
third option, learn german and become an high school physics teacher, not for everyone though, but with german you could at the very least be called as a substitute teacher sometimes? maybe by a private school too.