Fate/Grand Order: Forgotten Legends (FGO fanfic)

This is my first fanfic or story ever, I don't own either the characters or the original plot of FGO and English is not my first language --------------------------------------------------------------------------------------------- MC dies after being hospitalized for 6 months and wakes up in a white building where he is given the chance to reincarnate in the world of FGO with his own system and supporters