The timeline of people you actively follow isn’t the default any more. They push the machine learning driven feed as the default option and switch back to it when you restart the app.
With that in mind, Elons main option is to ask the algorithm for more impressions in the black box feed. That will get him into the feeds of non followers and show his tweets to followers when they eventually log in.
I experienced something similar on LinkedIn. I used to have a lot of followers and high engagement. At some point it changed such that the algorithm could bury you or promote you as it sees fit. At that point the only option is to write content that the algorithm promotes rather than content which your followers find interesting. Everyone worked this out and started writing their vulnerable virtue signalling stories for engagement, and the platform went downhill.
With that in mind, Elons main option is to ask the algorithm for more impressions in the black box feed. That will get him into the feeds of non followers and show his tweets to followers when they eventually log in.
I experienced something similar on LinkedIn. I used to have a lot of followers and high engagement. At some point it changed such that the algorithm could bury you or promote you as it sees fit. At that point the only option is to write content that the algorithm promotes rather than content which your followers find interesting. Everyone worked this out and started writing their vulnerable virtue signalling stories for engagement, and the platform went downhill.