-MMORPG: Divine Monster Transmuter -Mages are Too OP -Mini world of Endless fun AWAITS (He games a something like a playstation and it influences the real world and gives him powers so I dunno about this one) -MMO: Pierce Heaven Til’ It Breaks -Let me game in Peace (Games on a cellphone and gets superpowers so dunno if it fits) -Taming Master (vrmmo) -The Truth of Magic (MC goes back in time before a brand new game starts. What the world doesn’t know is that after a year earth will end and all will be send into that game. MC knows because he came back so a tries to get as many benefits as he can so that he won’t die when all goes haywire) -VRMMO Botanist (on my reading list, don’t remember even what’s the premise though from the name i think it fits here) of course a few classics; Legendary moonlight sculpture Rebirth of the thief Who Roamed The World
I think you already have what you need. So I can only recommend this: One Man Army - MC is 18 yrs old. https://www.novelupdates.com/series/one-man-army/