Can this be fixed? Breast uplift bad scarring & feel square

Your breast scars are not too bad (trust me, they can be horrible). The raised portions may be injected with a steroid (Kenalog) to help flatten them. You may try laser treatments (usually around 5-7) to get rid of the redness which aids tremendously with the camouflage. The lack of roundness would require a revision mastopexy (breast lift) with removal of portions of each breast scar.
Dr. Taranow

Hi and welcome to our forum!
From your photos, I note that the scars still appear reddened and elevated, suggesting that they are not yet mature. The scar interface itself appears quite thin. The breasts are relatively symmetric and full, without any evidence of sag. The nipple areolar complexes are at the same "altitude" on the chest wall. There is a degree of tightness of the inframammary segment of the patterns, resulting in some flattening of the inferior aspect of the breasts. The lateral limb of the pattern resides slightly low on the chest wall.
As the scars are still red, it appears that the revisional surgery was probably performed within the last 18 months or so. As such, healing is not yet complete and skin and scar remodeling will continue for that period of time.
Allow the redness to fade. Allow the scars to mature and the skin to stretch and soften. At that time, you can judge if lateral limb scar revision is still necessary. The boxiness of the inferior breast poles will likely lessen with time. If persistent, fat injections into the area may be beneficial.
Continue follow up with your plastic surgeon.
Best wishes...