Berserk, Dungeon Seeker Recommendations
Both of these manga follow an OP MC who just wants revenge while meeting new people. Berserk is more dark though and is not based in a dungeon nor another world like Dungeon Seeker. Berserk also is much older and has more chapters than Dungeon Seeker. But, if you are looking for an MC who is OP and love adventures, then you must read this.