When Seth Rollins returns to NXT in the future, as one would think would be the case, it would be fitting for him to turn heel as well. He was a heel the last time he was allied with Triple H, so it would make perfect sense for him to make this character switch when he aligns with The Game again.
Another reason this will be a fitting possibility (or probability) is that the original plan for the Universal Championship match at Crown Jewel was for Seth and Bray Wyatt to execute a double turn. This would mean Rollins would turn heel and Wyatt would turn babyface. This probably did not transpire because Vince McMahon could have talked himself out of a pretty good idea.
Rollins has also not done himself any favors on social media or in interviews in terms of carving a clean public image. Maybe he could take some advice from guys like his brother Roman Reigns or Dallas Cowboys quarterback Dak Prescott. All Seth needs to do to repair his public image is to consistently keep his head down and put in the work while ignoring the noise. All the rest will take care of itself.
Seth simply cannot allow other people to trigger an emotional response out of him when they offer criticism. I myself have made great strides in the last couple of years to work on this. The thing I learned was to be content with who I am and to not care so much what others think. Seth Rollins probably knows this better than anyone because he has done podcast episodes delving into these deep, esoteric concepts about the purpose of life and whatnot.