Dear @ryansng, like Paul said there is'nt a native solution from Squarespace to import content/presets generate from another website (from Blueprint AI or normal conception).
But I think also you should not begin a new subscription, it's a lost of time and not really a good practice.
The solutions in that case could be:
In order to recover the global design: copy/paste all the elements from the Styles menu from you new site to the current one (colors, fonts...).
In order to recover the layouts and pages: you can buy this extension https://www.squarewebsites.org/sqs-tools-extension-license/p/squarespacewebsites-tools-lite-year-license
It is a little technical but it's accessible. It's also a cost so normally it's more a profesionnal tool. It depends if you really have the need. Otherwise, you just (like presets) copy layouts from the new models you have.
Hope this can help!
florencepicol's post in Redesigning website with Squarespace Blueprint AI was marked as the answer
