If you have the space, rent a few rooms out, or your whole house when you are traveling or on vacation. This can bring in some extra money. You might not feel 100% with strangers in your personal space but this can turn out to be a great hustle. It might even help you downsize and de-clutter a bit.
If AirBnb appears to be a lot of work, find one or two good roommates that you can rent your extra space to. Investing the time in getting just the right people will pay off in the long run.