FPS? while it's a TPS, try Splatoon 2
Last edited by Bofferbrauer2 - on 18 March 2019
As for RPG, Xenoblade Chronicles 2, obviously. Also, give Golf Story a shot, really worth it. The Grandia I and II remasters and the Final Fantasy remasters might be interesting if you missed them before. Edit: How could I only forget Octopath Traveler? Get it! Right Now!
I don't know what other consoles you own, so not sure if I should suggest some multiplat titles which didn't make it to PC.
If RTS includes Tower Defense games, there are a couple of them on the Switch, most notably Aegis Defenders and PixelJunk Monsters 2. Also, there's Constructor Plus and Swords and Soldiers I and II (only played the first one on my Wii U, not bad at all, but totally moronic plot) as interesting RTS titles. Valkyria Chronicles 1 and 4 may be very interesting for you too, as they blend RTS, Turn-based Tactics and RPG into one
Oh, and on a general note, look at the link in my signature. It hasn't been updated for a while now (really need to find some time for that!), but might give you some pointers.