I keep feeling frustrated as valuable knowledge for my different hobbies over the last years became siloed away in corporate social media. I believe wikis could be a way out, but can we have decentralized, federated wiki software that can kind of talk among each other?
Miraheze Will allow you to make a wiki and you only have to stay active. Another option is Pepperminty Wiki if you plan to self host, this one is the simplest and also annoying to understand.