If I change my Apple ID will I lose all of my current info?
What will changing Apple ID do? Lose everything?
iPhone 7, iOS 12
If you create a new Apple ID, you will lose access to much of your data and all previous purchases made by the old ID. If you do a name change to your current ID, you shouldn't lose anything.
Note the restrictions in the article.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.