 If you liked
Kaiko sareta Ankoku Heishi (30-dai) no Slow na Second Life
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 ...then you might like
Lv2 kara Cheat datta Motoyuusha Kouho no Mattari Isekai Life
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Guy has falling out with army for being weak, is expelled, but is later revealed to be OP, and settles down with his wife (encountered after exile) as a neutral party to the ongoing war.
Extremely similar plot and overall vibes.
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Recommended by Andrewapps