I was going to recommend Logseq as well. I use the git plug-in on laptops and Working Copy (git on iOS) and some automations to sync it on mobile.
Nostr gets rid of the notion of servers and admins. At a high level everyone on nostr owns their own account (no central instance). When you want to post something you send your content to a list of relays you choose.
Other people can choose what relays they want to subscribe to.
Relays can block people from subscribing or posting.
Everything is cryptographically secured so there is no way for someone to pretend to be you.
Lemmy is different where the instance admin has complete control. Admins can post as you and users cannot easily migrate to a different server.
YSK: Feel like you only see the same 2-day old content? At least on lemmy.world, you can change your homepage's default sorting type & scope to "Hot" and "All"
Unclassified FBI Document: Ability to legally access Secure Messaging App Content and Metadata (January 2021)
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Sounds like you need some more hobbies to throw at it. :-)
You could always inflate the numbers by giving it artificial load but I imagine that breaks a ToS somewhere.