I'm The Last Boss Yet I Still Wanted To Become An Adventurer! Demon Lord Hero

Takeru Yukiya is a former Japanese college student who loves role playing games (fantasy type), watching anime, reading manga, light novels and wuxia (simply an Otaku) died in an accident and reincarnate in a fantasy world he always dreamed of but what he really yearns is to become an adventurer and join a party for him to subjugate the final boss but apparently he got reincarnated as the final boss.
Now what would Yukiya do now?