<I don't remember when I tried to play Final Fantasy XIII. It was a few years after the game came out, but definitely more than ten years ago. In general, I don't remember much about the game at all. I didn't hate it, but I certainly didn't love it. It made me feel nothing. Nevertheless, I kept playing. At first I told myself, "I paid for this game, and I'm gonna get my money's worth". Besides, I was told by several people that the game opens up and gets good around thirty hours in. I can make it that far, right?
I don't remember how far I got but at some point, perhaps for the first time ever with a video game, I asked myself why am I doing this? I'm not enjoying this game, I'm just going through the motions for the sake of finishing it. I turned it off and never played again. It felt great.
Many years later, I have quit a lot of video games. Most recently, I am getting similar feelings playing Metaphor: ReFantazio (maybe more on this another time) and I might be done with it. Yes, I still get the knot in my stomach when I think about how much I paid for the game. I've also been told it gets better later on, despite already being twenty hours in. But even if I finished it, I'm not getting my time or money back. What I can get back, or prevent losing at least, are the dozens of hours I could spend going through motions of completing the game.
You don't need a reason to justify quitting, you can even quit good games. Earlier this year I stopped playing Dragon's Dogma 2, a game I think is pretty amazing but I was getting really tired of toward the end. There's a lot of nuance to how I feel about the later part of the game and I could explain why I felt I had good reason to quit, but I don't have to. At the end of the day I wasn't having fun anymore, so I stopped.
You can apply this to any kind of entertainment, anime or TV shows or whatever you get yourself into. Maybe you decided to take up knitting and you discover you hate it, I dunno... point is, your time is more valuable than anything. If you've voluntarily chosen to do something for recreation and you're not getting enjoyment out of it, you can voluntarily stop. I highly recommend it.