I had similar problems, although with much worse results. I joined this forum early 2021 after being diabetic 10 years. I went low carb and fairly quickly got my HbA1C into pre diabetic levels (although never lower), but early 2923 my levels started to go up. I didn’t change my diet or activity, and nothing I did could bring them back down.
I don’t have any answers for you I’m afraid. If you are certain nothing else has changed then it might just be your body.