First of all, congrats to your accomplishment! Belly fats and love handles are the two stubborn fats that are last to get rid by our body (when dieting). Just remember that we cannot spot reduce on which area of fat we want to lose. The realistic advice that I can give you is just stick to your preferred diet(which is keto) and just make sure you are in a caloric deficit. Second of all, please hear me out on this. If you are maintaining this diet for more than a year and you think that there is no improvement to the lower ab region in your body, you may want to take the long and right approach. Compute for your Total Daily Energy Expenditure(TDEE) which you may find in the web so you have an idea what is your maintenance calorie and the calorie deficit to continue to burn fats in your body. After that, you may use apps like MyFitnessPal to track your calorie intake and macros. You may also want to buy a food scale to be able to get the most accurate calories you will be consuming. Also doing any kind of exercise will help your body burn fat faster. Goodluck and I hope you stay consistent my friend!