 If you liked
Tensei shitara Slime Datta Ken 2nd Season
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 ...then you might like
Sword Art Online: Alicization - War of Underworld
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- Battles of monster faction and human faction
- Multiple stronger characters among mooks
- Main character being weakened, incappable to participate
- Characters from original world of protagonist have impact on the story. Its hard to find something like this in other isekais