Such scars are notoriously difficult to erase. Fractional carbon dioxide laser & micro needling may help improve the skin texture somewhat but the scars are likely to be still quite visible even after several treatment sessions.
Patients often ask me if surgical skin grafting is possible but this option replaces the linear scars with a much more obvious skin graft and is thus not recommended at all in my opinion.
When current medical/surgical techniques fail to offer significant benefits as in your situation, do not abandon the more practical approach of simply covering it up with long sleeves or with a corrective foundation whose colour most closely matches your skin. You may wish to check out the newly opened “Shiseido Life Quality Centre” at Frasers Tower (no conflict of interest) where special custom blended concealers are available at fairly reasonable cost.