I have successfully been employing subcisions, both individual and Field Subcisions, for treating acne scars for nearly thirty years. The kind of extensive acne scar-related cheek atrophy seen in the photos would NOT be expected to do much to improve the overall appearance. So, no surprises at the lack of success with this approach. A Field Subcision, properly performed, that treats the entire cheek is much more likely to yield the desired overall improvement in the overlying scars. Microneedling, which I have been performing for nearly a quarter of a century, is best reserved as a "polishing" step for treating any residual, superficial color and textural abnormalities, AFTER more appropriate acne scar treatments have addressed the major problems. It is not a particularly useful primary treatment for acne scars, as you have unfortunately found out the hard way. What's more, when microneedling is employed, manual microneedling, instead of RF microneedling, avoids the added expense and added risks of the RF approach. CO2 laser, much like old-style dermabrasion, is simply an aggressive, ablative, destructive process of essentially skin sanding that typically engenders significant post-treatment downtime and has risks for scar. And besides, it does nothing for restoring the atrophic volume loss responsible for the sunken cheeks. You would be wise to make sure to consult an experienced, board certified cosmetic dermatologist acne scar treatment specialist before wasting more time and more money. Hope this helps and best of luck.