This nail looks rather damaged. Perhaps another extension is not a good idea at this stage and give your nails break? How are your other nails looking in comparison to this one? Or have you not seen underneath them due to doing fills each time? If so, I would suggest only doing fills a few times, before doing a full removal and reapplication. This way, you get to see the condition of your nails and can pick up any conditions or issues which may arise, which you may not be aware of should you continuously do infills. Perhaps if you soak all your nails off, a good nail treatment or a break from gel for a while to give your nails a chance to recover. Take into consideration things such as natural sunlight, oxygen, all contribute to well conditioned nails. Best of luck