Iconoclasts, The Awesome Adventures Of Captain Spirit, The Adventure Pals, Minit, Ni No Kuni II: Revenant Kingdom, Overcooked 2, Celeste, God of War, Spiderman... should I continue? These are all games that came out in 2018, by the way.Single player is a thing of the past, companies now focus more on multiplayer, because the money is in the multiplayer.
Surely single player games are not going to fade away, but this is not like the 90s and early 00s where the main dish was the single player and the desert was the multiplayer. Now it's the other way around.
Sure there are some greats Single players, but they are just a few titles.
Again, just because you don't see flashy ads everywhere about these games doesn't mean that they don't exist. If anything, you're proving that mass advertising works great because a lot of people like you believe that there are no great single player games that come out every year anymore.