Can't wait for next season loved the chibi art at the end. If I was skeleton I would go find more lium lun and get the lich job or if not then just grind bosses and make great achievements to unlock the secret prize of the store while also gaining levels.
MC is the only reader of the light novel to stick with the story to the end so when he says others like him that means people that read the story but dropped it years ago have amazing memory. I don't think they will become too much of a threat since he has the same knowledge.