Nobody knows if your body and lifestyle can achieve a lower HbA1c. Mine seems to run at 31-33, and I'm content with that. It is some margin from a pre-diabetic level and I am enjoying my diet and overall lifestyle. For me, it feels like a lifestyle I can sustain.
Who knows how my body will physiologically hold up as I age. I may be lucky or not, but I'll take my chances.
My hypothesis is that we all have a bit of a range where we routinely run, in a healthy state. That's not governed by any particular number. There are thousands of people out there running around, happily, healthily with blood markers like ours, and margins worse, who don't give it a moment's thought.
Only you can decide where and when you accept you're in "your place". "Your place" is about the scores youo achieve, balanced with the effort required to achieve it, and how you can cope with doing that day-in/day-out for the very longer term. To my way of thinking, there's little point in me half killing myself to shave another couple of points off my HbA1c score next time around if I can't live on like that. This condition truly is a marathon, not a series of sprints; although in the early days it may feel that way.
Very well done on your achievement thus far, and good luck with whatever goals you set yourself, moving forward.