Apparently, one piece of online folk wisdom goes as follows: If you’re having trouble with your Apple ID, just create a new one and abandon the old one. This actually isn't a good idea in most circumstances. It usually makes a bad situation worse.
Apple IDs can be a problem, especially if you have legacy accounts from pre-iCloud Apple cloud services. Apple has made it easier over the years to use one Apple ID for purchases and another for iCloud, which was a big help. The upcoming macOS 10.15 Catalina rejiggers account management so your various Apple IDs are consolidated into a preference pane that replaces the iCloud one, very similar to iOS’s Settings app.