FWIW, for Blue Card holders, after 27 months the language requirement drops to A1 and even if you don't have a Blue Card after five years you could also get an EU permanent residence without language requirement: https://www.make-it-in-germany.com/en/visa-residence/living-...

Though I would recommend setting yourself a target of some small (≈10) number of new words to learn every day and practice them during your commute or so. B1 is achievable in under a year with consistent practice. The official word list has 2400 entries: https://www.goethe.de/pro/relaunch/prf/de/Goethe-Zertifikat_...