Manga With OP Mc? (Not Isekai)

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https://mangadex.org/title/48045/sousou-no-frieren

The MC already defeated the setting's big bad prior to the beginning of the story and the action scenes have reflected that in a pretty satisfying way so far.

 

[Falador]

Dragon ball super/Dragon Ball heroes.

The power in these series is insane.

In super casual punches can erase entire multiple universes if uncontrolled.
In Dragon Ball heroes pretty much everyone of note can destroy infinite time and space and the hax are pretty broken.

The reason the universe/multiverse isnt destroyed when people fight is because they minimize the area of effect of their powers. Its the same reason the hulk, superman, Galactus or franklin Richards don't destroy everything in their fights.