Growing --
These ideas work for anyone, I think. Thanks for starting an insightful thread.
As someone who worked as a librarian in the local public library for four years, consider even asking if your public library needs any volunteers. We would have a huge variety of people who would come in and help with different tasks. It was great for the library and people who love books are wonderful to have around. And, if a little independent time is wanted, many of the tasks we had our volunteers do were single person jobs - things like reading the shelves to make sure the books were in order, etc. You're not isolated, but you can wait until you are comfortable before deciding to interact with others.
Just one more thought to add.
I'm going to go walking myself.
UM