Pretty much what the title says. Something like Solo Leveling or the Gamer. A leveling system. Petty modern morality systems shouldn't stop the MC from killing when necessary (or beneficial). Better if MC is either decently strong or very smart if not that strong.
Maybe Life Howling or Dusk Howler would be good. Dusk Howler is vrmmo though. Those are the only two that spring to mind right now. Hope it helps.
i cant give you something like Solo Leveling, but try The Last Human. is not leveling system but i think you may be like the MC.
I absolutely hate VRMMOs. Unless the characters get transported into the world. Reading people play games is not fun at all for me. Never said he does. I am asking for that in what the commenters recommend.
Then try Life Howling. Its not vrmmo. The guy along with others gets transported into another world at night, where they can learn skills and magic etc. These things can also be used back in the real world too. Seems like the kinda thing you’re looking for.