The main restriction here is people willing to volunteer. We have tons of specs desperate for more maintenance work. If you'd like to get involved, please do so, and if you can spend significant amount of time on any of them, I imagine their current editors would be happy to add you to the team. (I certainly would, for the specs I edit.) You can get started at https://github.com/search?q=is%3Aopen+label%3A%22good+first+....