Etrian Odyssey IV: Legends of The Titan
Normally, I'd prefer if other games in this series had more elements from this game, but I'd love if there was a greater focus on non-quest/non-story events/interactions. There's some wonderful ludonarrative in the base game, but its mostly due to the combat and resource system, and having some more moments where the game asks you to interact with your surroundings would be splendid. In the first stratum, there's a good number of interactive sections, where you have to decide whether or not you want to eat some potentially unripe fruit, or if you want to leave some supplies for other explorers, and moments like that in later stratums would be amazing. Perhaps in the snow stratum you find a natural hotspot in the frigid cavern, and while you can stay and rest for a moment, it opens your party up to getting ambushed by monsters, or you can accidentally stay too long and risk hypothermia.
Nier: Automata
Give more interesting gameplay with the other playable characters. While 2B feels wonderful to play as, 9S's hacking minigame gets fairly repetitive after extended play sessions. The more offensive moveset of the last character is somewhat distinct from 2B, but they end up playing so similarly that I legit forgot their moveset was different until writing this post.
Pokemon Platinum
I would just move the Move Deleter to somewhere earlier in the game. I hate using HM slaves, so I load up some HMs on my team, which usually have decent usability for a while, but I don't want my Roselia to have Cut anywhere past the third gym.