You may be playing the wrong game, at the wrong table, with the wrong group if …
You gain enough experience to level up your character, but when you look at all the cool and interesting new character and narrative driven things you could do now, you realize that none if it will ever happen in your game because everything that happens in the roleplaying game at your table is tactical wargaming. So, you give up and decide to minmax, as that’s all that matters.