Bro, you really can't do this to yourself. If you really feel like you have zero motivation left, cancelling the project is the best option. Or at least, putting it on hiatus. Take a mental health break, you deserve one. Everyone who contributed to the project does. This is without a shadow of a doubt in my top 3 best visual novels I've ever played. And no cancellation will ever intersect that. If the project is truly not what you want to have to deal with in your life right now, it shouldn't be. Depression is no joke. Your top priority right now should be working on yourself. So go on, fight it, because you can't let this stop your will to live. If you manage to get through this stage, which I know you can, maybe you'll want to make another statement here. If not, that's totally fine. You should do what truly makes you feel better, man.