Powerlifting will cure this very fast.
Discussion
Any lifting, really, makes a humongous difference in 1-2 months
Try the farmer’s walk exercise. Simply hold 2 weights at your side and walk. I do this everyday and it makes a world a difference
Or become a bricklayer
Swing KBs
Yeah, deadlifting and squatting with proper form and appropriate weight keep posture in check for sure