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_...
This. With this much income you should qualify for a Blue Card. The 27 months start when you are eligible, not when you are actually holding the Blue Card. A friend of mine (w/ Blue Card) got permanent citizenship in Germany after the 3 years and was not asked/tested for any language skills. As long as you speak a little German to follow the process it is pretty easy.
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_...