Stay with what works
I started with IVIG and kept going down hill for another 3 to 4 months. All my friends had advice and wanted me to change treatments, but my neorologist advised staying the course. Things finally bottomed out and stayed that way for a number of months and then started to slowly improve. After more than 6 months, improvements went a bit faster (relative). I’m glad I stayed off steroids because of the side effects. IVIG does not nhelp with healing, only to stop further damage, as far as I know, there is nothing that facilitates healing of the nerves other than time.
I hope that helps.