AfD is not relevant anymore. They are openly pushing Russian economic interests now (Nord Stream 2, lifting sanctions) and so became a used asset.

AfD is gaining support in Germany: https://pollytix.de/wahltrend/

And to highlight, those are the national numbers (12% as of time of writing).

The current numbers for Saxony are at 28% [0].

[0] https://www.wahlrecht.de/umfragen/landtage/sachsen.htm