Only thing the AFD has to to is to keep their feet still and wait. The ruling parties will do the rest.
First time I heard that, what bubble are you from?
Being incompetent and shortsighted is enough. Being blinded with the idea that Germans will keep electing them and choosing them for power feeds their incompetence. They want extreme powers now. They don't think the extreme powers they give to the various organizations will be used against democratic society. This is just the repeat of Weimar republic.
Meanwhile they are filling Germans with hate against minorities and benefactors of the social system which legitimizes AfD. They also keep doing nothing (which is their core-competence really). They fix no parts of the broken system. This legitimizes AfD even more.