 If you liked
Maou Gakuin no Futekigousha: Shijou Saikyou no Maou no Shiso, Tensei shite Shison-tachi no Gakkou e Kayou
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 ...then you might like
Shikkakumon no Saikyou Kenja
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Both have OP MC who was the strongest during their time and then got reincarnated later, only to find out that in the current age their magic was considered the weakest. The clowns who think they are strong challenges the MC but those fools don't know who they're dealing with.
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Recommended by goodbyedays
In both anime, the MC reincarnates into the same world after a very long time (the reasons are different).
The MC possesses great knowledge of the world.
Despite being one of the most powerful, they both make team with a few people and dedicate time to help them improve.
I've got the same vibes from watching them, apart from Maou being more gory at parts. Maybe Shikkakumon has a more of generic basic setup, but I'm sure if you liked one, you'll like the other as well.
The strongest person reincarnates in the same world but in the future where magic and power levels have declines so they are still the strongest. Everyone looks down on MC's but every time they surprise them by whowing them the difference in stregth.
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Recommended by iwsifakismag
Both are similar for the MC's background story. Ancient conflicts between humans and demons. Schooling for magicians and others with magic skills and combat. If you ike powerful protagonist rekting traditional schooling rules and making his name through a supposedly "peaceful era" both are good choices. Just pointing out that, besides this, Maou Gakuin MC is a Chad and Shikkakumon MC still a Padawan. Overall, the two are powerful for the average cast though.