I wouldn't bother "advertising" unless you're looking at freelancing, it might come across as desperate.
There are some places where recruiters will constantly look for candidates: LinkedIn, XING (not sure if it's worthwhile outside Germany), Github, maybe SO (not sure), possibly FB. Having a polished appearance there will yield plenty of contacts even without indication that you're currently looking for work (assuming hard skills that are in demand somewhere).
There are some places where recruiters will constantly look for candidates: LinkedIn, XING (not sure if it's worthwhile outside Germany), Github, maybe SO (not sure), possibly FB. Having a polished appearance there will yield plenty of contacts even without indication that you're currently looking for work (assuming hard skills that are in demand somewhere).