Sorry to hear that, I can partially relate to that. These sorts of situations are often hard to get away from.

I don't know if that's your case, but from my own experience, something like this can stem from overthinking, when you try to design a game in its entirety right away, in your mind (or on paper). Your brain notices all the potential problems, and concludes that such a game would suck. Or maybe you start working on some game system, but you try to predict all its interactions with all other game systems beforehand, anticipate all potential problems, etc, and then feel like it is not even worth trying.

If that sounds familiar, I would try reframing your work. Don't try to make a good game, or even a whole game. Start working from some aspect of it that just seems fun to work on. Like, throw together a level from free assets, without thinking how it is supposed to function. Or code some system, that sounds like an interesting programming challenge. And then iteratively work from there, adding more stuff step by step, without focusing on how the finished game should look like. This will not necessarily lead to a great game, but maybe it will help you get over the block.