You could try an external TTS system. Whisper is available for free and comes with a ton of settings. On setting is to specify the language model used (so the size of the data the model is based on). A bigger model means that it recognizes words better for the price of more time needed.
Faster-Whisper-XXL, which is what I have been using from time to time, allows batching. So you can tell it to transcript a folder with several files in it, and during that do something else.