 If you liked
Ore dake Haireru Kakushi Dungeon
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 ...then you might like
Isekai de Cheat Skill wo Te ni Shita Ore wa, Genjitsu Sekai wo mo Musou Suru: Level Up wa Jinsei wo Kaeta
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These are basically the same premise, and if you like one you will surely like the other.
Typical guy finds a dungeon/door to another world that only he can enter. Said world/dungeon grants him numerous powers and makes him OP and instantly attractive to all the ladies.
Each anime follows their journey as they impress people with their unique powers and regularly go back to their respctive dungeon/world to train.
If you loved one, the other will be right up your alley!
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