In general, I recommend a few things:
See if there are any open source places that are looking for UX help. I’m currently volunteering with GitLab, for example. There are also things like Code For Boston — where are you located? Code for Boston, at least, is very much a thing you want to be able to attend weekly meetings for.
If you are willing to do both research and design of the non-visual sort (eg making mockups and prototypes), you may be able to find a friend who needs your help on a crazy idea they have.
Finally, check if you have any local UX groups — they may have useful ideas that are relevant to wherever you are. If you don’t, maybe try contacting your local governmental businesses and things like libraries about helping with their site.