If you have an online presence or audience, whether its a blog, podcast, social media, online communities, forums, etc. Most of us tend to naturally hold onto things and if not truly essential to everyday life they end up under the bed, storage units, closets, shelves, etc. Organize the different items you deem unnecessary, clean them up, take some photos and get them listed for sale. There are plenty of other platforms like eBayCraiglist and Amazon to turn that clutter to cash from home. Turn that clutter to cash with only minimal work needed on your end.