You are not required to do this. It doesn't even mean you have to stop making new things, you can just not take on that role as a focus point of each of their respective communities.
As a user of a library, I don't hold it against their author when I find a piece of software that is abandoned. I will create my own fork and start maintaining it if I have too, or understand the state that it's in. I will find alternative avenues to discuss issues if the GitHub issue tracker is closed.
Just don't make yourself the center of a community if you are going to unleash a stalebot trashing other people's genuine issues. You are making it impossible for someone to fork. because they would be competing with the author; people might even find it distasteful. So everyone is forced to go through you, leading to both suboptimal software governance and burnout on your part. You are not getting paid, why force yourself?