Isekai Non overpowered but still strong enough MC Happy ending or atleast an ending Uses Modern Knowledge Non dense, smart MC I have already read RTW, Mushoku Tensei, Warlock of magus Give me something to read like them It may even be a fan fiction At least have a ending or non cliffhanger
Plague Doctor - the MC just can't get a break. He's not OP, what the point of comparing with fellow human being anyway when the whole world is f*cked by Eldritch horrors, Great Old Ones, Outer Gods? He's talented, that's the deal! Without him, I don't know if human even keep their own form and sanity to survive at all. Still, he isn't overpowered, any "small" eldritch horrors in the cosmic scale can still f*ck him up very badly, and by extension, countless of people may have their brain burst into tentacles too. Embers Ad Infinitum - the MC doesn't have anything apart of obvious plot armor and his slightly interesting superpower to help him in the post apocalyptic wasteland. No, the plot armor isn't a bad thing, unless you want to see the interestingly crazy MC dies in a ditch somewhere, either died in agony or willingly die by whatever mind controlling mutants or superpower bearers' command.
Maybe: Kumo Desu ga, Nani ka? Housekeeper of the Hundred Blossom Palace Ascendance of a Bookworm Tensei Shite Inaka de Slowlife wo Okuritai Werewolf Reincarnation
female mc : - Common Sense of a Duke’s Daughter - Ascendance of a Bookworm Male MC : - Evade The Hero and Flee! - Re:Zero kara Hajimeru Isekai Seikatsu
These are all progression fantasy stories where the MC starts relatively weak but quickly grows more powerful Talyn: Rebirth Reincarnated as a Familiar Owlnother World Protagonist: The Whims of Gods Memoirs of Your Local Small-time Villainess Fated To Fall: A Transmigrator LitRPG Tale The Saintess has a Showdown