If you are a sysadmin or someone who is good at writing documentation or even good at co-ordinating people, then I would suggest that you contribute to open source. You can start small by joining the mailing list of an open source project or whatever else they use to communicate on e.g slack, IRC, Discord etc. Most projects would like to have people involved and you would be surprised how many things that you can help to contribute with, without the need for the ability to code.