i was dismissed from the heros party because they dont need my training skills so i strengthened my fief which i got as a replacement for my retirement money

a brief description of the manga i was dismissed from the hero’s party because they don’t need my training skills, so i strengthened my [fief] which i got as a replacement for my retirement money: this feeling, in fact, that i (27 years), who specialized in abilities [training], is no longer necessary for the unit of the hero, which has become more powerful in a concrete way. at first i was the center of the party, but in the end the hero drove me out of the party. however, because i “have made a great contribution to the party so far,” i received a small “feudal” in exchange for my pension funds. when my heart felt alone, leaving the adventure front line and heading to my own land, i thought about something, seeing 7 villages with their 2500 inhabitants. my thoughts are proper … curiously, in case i teach these people, will my land not be strong enough to win, among other things, the lord of demons?