The Rimanover Rebbe said reading the Aggada, Menoras Hamaor, heals the soul. And if there is something wrong with the soul, it affects the body. I would also advise one of the relatives to read a few pages near the person, because I also read a parent’s prayer for their unwell child is particularly heard Above.
On Friday there was a message going around on WhatsApp to have him in mind by lecht benchen, that he still needs a big refuah. Everyone should please continue davening for him.