Of course you can. Twitter/X doesn’t own your tweets. You can take them and post them somewhere else if you want.
This is all clearly stated in the Twitter/X terms of service. https://twitter.com/en/tos
Exactly, you can repost them elsewhere. That is the opposite of “you can’t take them anywhere else.”
And it sells access to the virtual land to advertisers who put up billboards all over it.
And it gives Musk powers that feudal lords never had. He has total control over which content grows value, and which remains ignored and barren.
Unlike a traditional publisher, however, to whom an author sells the exclusive right to publish a work, you have the right to take your tweets and publish them elsewhere. There are many examples of authors who have adapted their Twitter posts into blog articles or books, and published them on other platforms, or even in print.
As for the contextual value of your tweets, if the tweets form one half of a conversation with a real person whose tweets you cannot use elsewhere, then they can be recast in the form of a dialogue with a fictional person, something which has been done since the days of Socrates.