Metroid Prime series are more “action games” than FPS’ per se, but they are must-plays if you haven’t, & might scratch that itch. There’s a switch remaster of the first game, none yet for Prime 2 or 3 but it’s likely they’ll come out leading up to the release of the recently-announced Prime 4
It can become surprisingly complicated with axial deadzone settings, but that’s not really important to understand. The simple concept is it’s the zone in which the stick is moved but no change in movement is registered in-game. The complication that is added is mostly related to more precise calculation of where that zone is