I don't know if there is a decentralized enough Twitter alternative that will garner traction.

BlueSky and Nostr have Jack Dorsey behind (funded Nostr) and are advertised as decentralized, but I believe he has control.

LeoThreads puts content on Hive, which is decentralized enough, but the front-end and middle-end are controlled by the Leofinance team. But if another interface is capable of reading and interacting with LeoThreads (this is where Ecency may have made some progress), then centralization is avoided on this end too.

Decentralized Twitter alternatives are likely to be slow and not garner enough traction. That's why even those considered decentralized have elements of centralization that make them faster. The question is how much that affects account ownership and censorship resistance. I wouldn't trust anything that Jack Dorsey proposes as decentralized, knowing how much censor was on Twitter during his reign.