Hello ,
i have a German website and i want to promote this website in Google.de so i need some german submissions website or have any other ways to increase this website in German search engines.
You just need to do the local listing it will help you in German search engine.
By Promoting your site Locally you may get good number Of traffic and Business. Try Local Listing, register in Local maps, Local Directories etc… by doing all these activities you can promote your Business locally.
I will recommend Local listing.