Do activities stop being enjoyable? I suppose in a way, but normally I still get something out of having a little slice. I won't be immersing myself in another MMO like WoW though. The grind is in fact a grind that needs to be seen in a larger perspective.
I loved immersing myself in fantasy worlds, both literary and gaming, and gained immense enjoyment from doing so; but since I've had this "realization" I really can't care about lore outside of the main storyline and my enjoyment from such activities has considerably reduced. Not sure if that's entirely a loss though, as I now would rather focus on something that provides a more direct improvement to my quality of life in the future rather than fantasy trivia.
Do the last bit, but also consider working in some cannabis.
I feel this way about many things in my life that I used to care about that now seem insignificant due to that "big picture" feeling, e.g., all of social media; but if I focus I can enjoy the "little details" when, for example, my SO shares a meme. Also accompanies is that nothing is new, everything is a repost, etc.
It's a weird new sensation for me that I'm still learning to deal with, especially with regards to enjoying previously enjoyable activities. Or do I just drop them and search for better endeavours?