The animal actually looks good considering the previous feeding schedule, scratch off all your idea bathing, tube hydration and IV fluid, this animal does not need any of those and you will cause more issues than solving any by doing any of this.
This snake needs, proper husbandry, than use a warm damp towel to remove the stuck shed, provide fresh water every other day, limit your intersection, NO handling, no petting while changing water, than after a week offer a live adult mouse.
This snake is nowhere near dying it has some stuck shed and was not fed adequately for a while which.co soldering the size had no effect.