Why are you creating so many AppleIDs that you cannot even remember them all? There is no need to really ever make more than one. Just change the primary email if your email account changes - https://support.apple.com/en-us/HT202667
Remember that along with issue such as activation lock, everything you purchase from the iTunes, App, iBook or Mac store are permanently tied to the AppleID used when purchasing. All the data you keep in iCloud is tied to the AppleID used to sign in to iCloud, and none of the information associated with an AppleID can be transferred to a new AppleID.