I can kinda get all that, but what I’m missing is the role of your history in this question. (I assume that this is about saving your own posts).

Keeping the account for occasional use & maybe putting a sticked post in your post history with links to your new account on a different platform, I can kind of understand. But the way I see saving my own history, it’d be about reading back my own posts, which don’t really serve me a function on a different platform.