It's pretty tough for a manga to get serialized so beyond his health issues this will be a big blow to the author. Hope he bounces back both personally and professionally.
Yeah because there's no story left. The web novel ended after the stadium battle. The manga artist is keeping it going by turning it into a gag manga.
I wish Mirio would fuck Valetta and start a harem already.
If you like romances involving elves check out "The Story of a Couple with a Huge Age Difference". You can get the raws from sites like manga-zip.
https://mangadex.org/title/83dab494-1639-466c-a18d-9132529d20c2/sugoi-toshinosa-fuufu-no-hanashi