Germany could offer Hutterites, Amish and other German speaking people to settle in the east for free land. You get German speaking people with a high birth rate, happy to repopulate the emptying country side.
Wouldn’t work since some if not most would want to homeschool. Germany does not allow that. Europe along with America is rotting from within. If they don’t make some serious changes their culture will be lost. They need to start having babies for starters.