Hi Martin_Wh and welcome
Did they tell you what your HbA1c result was? That's usually the means used to diagnose, which implies that you're somewhere over 48 mmol/mol. Depends where, though. Many people on this forum (and I'm one) have had success adopting a low carb way of eating. This means eliminating most, or nearly all, carbs from the diet - so I don't eat bread, pastry, rice, cereals, pasta, most fruit, and most root vegetables.
That brought my BG back to normal levels (without medication) within four months back in 2020, and since then I've lost around 40kg - I'm not sure exactly how much because my scales stopped registering anything above 118kg, so I don't know where I started.
You've obviously got a glucometer, and I'd recommend using that before you eat and again two hours later. That should show clearly how well your system handled the carb in what you ate. The two hour figure is not the peak - that will happen round about 45 minutes after eating - but it does show you the thing you're most interested in, which is how well your system copes with what you eat.
best of luck. This forum is a really good resource of lived experience, and there is absolutely no limit to the number of questions you can ask. You might also want to take look at the "Success Stories" section which should give some idea of what can be achieved.