I Was Dismissed from the Hero’s Party Because They Don’t Need My Training Skills, so I Strengthen My [Fief] Which I Got as a Replacement for My Retirement Money. Chapter -- Discussion

No real proper rating yet, but it’s broken the trope so far. The MC leaving the party, calling it a dismissal is a bit ehh. More like a retirement. It’s a lot more complicated than just being fired. Adult stuff that would make the unemployed NEETs depressed.