I'm going to echo a lot of the earlier comment: You look fine / unremarkable, as far as having a "passable" male chest goes. Sure, you might find the appearance a bit more aesthetically pleasing if you worked out a bit, it certainly couldn't hurt, but I don't really think it's necessary.
Hell, in my case, I lost both nipples cos the surgeon (Dr Wilson in Detroit) told me I could "shower as normal" the very next day with skin grafts, the revision that I had to literally scream and make legal threats to get, looks only-OK on one side (I've only known one ostensibly cisgender man with nipples that huge) and the other side looks very unusual, almost like an inverted nipple, but not (if that makes sense)1, and somehow whatever Mediterranean-origin throwback genes I have from my Black Irish father has given me massive hypertrophic scarring in the centre of my chest --but nobody seems to remark on it when I'm shirtless in public. If nobody's been taken aback by my own nonsense, nobody's going to think *your* chest looks at all unusual.
We're all too often our own worst critics, and yeah, you might just be looking at the scars a bit much. The scars always look better after at least a year. If you still think there's room for improvement, try working out, cos short of silicone pec implants, I doubt there's anything else surgery could do for you. (And don't seriously consider pec implants, I've never seen anyone get those and *not* look like a muffin pan, after.)
1: I was pretty much locked in to going with that particular surgeon, cos I'm on Medicare, and Disability, and he's pretty much the only one in my state who'll take Medicare, and obviously I can't afford to take an out-of-state trip for surgery.