If you're not feeling fulfilled by an accumulation of stuff, then try the opposite. Give it away. Find a bunch of stuff you don't want or need anymore and take it to Goodwill or take it to a local hospital or orphanage or some such. 'Tis the season, eh?

I donate pretty regularly, but that's not quite too fulfilling. However, several years ago, I liquidated my sports card collection. I pulled out a few I wanted to keep from a collection of about 20,000 cards and took the rest to a hospital for them to give out in their pediatric ward. It felt pretty good.