I Got HBa1c Checked 3 Months Back Which Was At

I got HBa1c checked 3 months back which was at 9.7, thereafter I started controlling eating habit and walk of about 30 minutes a day for next 2 months. In previous month, I continued controlling diet but reduced walk from 7 days a week to twice a week. Last week repeated HBa1c test which gave result of 6.8.

Can I continue with present practice or I need to make some changes to reduce the HBa1c further.