You can try an app like Motorola Migrate or Samsung Smart Switch.
That's why I have always resisted integrating my microSD card with internal storage: internal storage is not safe, in my opinion. If I have all my data in internal storage (which would include extended storage) and drop the phone, bad update, can't boot up, etc., how do I get to my data? I don't. It's as good as gone. That's why I keep my files on the card. If the phone breaks, I pop out the card, put it in another phone and keep going.