Could the free voter enter federal politics???
Not this year, but if they manage to join the state parlament of Rhineland-Palatinate, this could be the start of them entering more state parlaments; they've already got stronger in many states. Then they would not be a Bavaria-only phenomenon. If they succeed in RLP, what I doubt at the moment, this could be a signal to voters in states like Hesse, Saxony, ..., that they can make the 5% threshold.
If they manage to get into enough state parlaments in the next 5 years, I could see them entering the Bundestag in 2026, but that is a big IF.