I do not feel sorry for Mirai Nagasu AT ALL.
She has had a long career in skating. She has traveled, had sponsors, competed, won titles and accolades and even went to the Olympics where she skated the best of her life. She also has the benefits of always living as a competitive athlete.
Her life has been, on the surface, full of wonderful experiences. Just because it may be winding down is not a reason to feel sorry for her.
She has not lived up to her potential. And she can't do it no matter how hard she tries. We don't know if she has a long career ahead of her since the depth of US ladies is improving. She may have harder time making US team in the future.