PyTables is actively seeking additional maintainers and developers. If you are interested in becoming on, check out our developer resources on the PyTables website: http://www.pytables.org/development.html#pytables-development
In general, the barrier to entry is lower when making a docs contribution. We encourage you to check out our open docs issues: https://github.com/PyTables/PyTables/labels/documentation
If you want to stay up to date with PyTables development and communicate with the development team, consider joining our developer mailing list: https://groups.google.com/g/pytables-dev
Do you have an idea for a contribution but you are not sure if it fits into any of the aforementioned options? Please open an issue and propose it! We are happy to help support contributions of all types.