I started reading this a while ago but I can still remember most of it. The MC is a player type person who uses stats and skills (isekai basically), he kills the final boss of his world (a lich guy I'm pretty sure) and is sent to another world which is way harder than the one before. Like a random goblin is on the higher level then the final boss from the last world. Once he gets to town (which is like a million miles away, cause everything is bigger) he finds out there are two other types of people there, players like him, Murim cultivators and some holy bold priests. Its basically a double isekai. And I'm pretty sure its Korean.
it might be this Max Level Newbie highly probable (all i did was just search "a level 90 goblin" on NU search engine)