>>713391153Fire Emblem: Sacred Stones and Fire Emblem: Blazing Blade are available on Nintendo Switch Online service. These will be your purest titles to play as well.
Fire Emblem: Three Hopes is actually playable and vastly improved on the Switch 2, though it is a Three Hopes AU Sequel that is a Warriors game.
Fire Emblem Engage is also available on Switch, which is a decent entry, and depending what you liked about Three Houses, you'll either perceive better or worse. The persona-like shit got old to me in 3H, so I did like it dialed back in Engage.