Decentralized governments/leaders in small communties, decentralized power sources, decentralized market, currency and so on. On top, every community gets own decentralized social network.
Everything is already decentralized if you think about. There is no central Earth government.
We may be thinking about what size we want communities to be. My answer is that it depends on the community. Climate change council? Probably needs to be a global community. Street cleaning? City level community. And so on.