iCloud and appleID confusion

Clay142 Said:

"iCloud and appleID confusion:"

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A. Assuming you mean download...

Download, then Upload iCloud:

Q1. "Can I downgrade from 2TB by unsubscribing, then upgrading again with the other AppleID, or is this a bad idea?"

A1. Yes. Note that purchases cannot be synced across devices. So, you'd have to perform the data transfer manually. You would download it to an external drive, and then upload it all to the iCloud Drive on the other account. Enable iCloud Drive in the System Settings. Use my user tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip

B. Finding Apple ID Purchases:

Q2. "I don't remember what AppleID I used for the 200GB plan, and I don't want to lose my files."

A2. View your subscriptions on your Apple ID: If you want to Cancel a Subscription from Apple - Apple Support

Clay142 Said:

"iCloud and appleID confusion: thanks. This doesn't explain why the problem happened (lack of syncing to iCloud), but you have provided me with an easy way to back up my iCloud account so I can troubleshoot. Clay"

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Thank you for letting me know that my user tip is helpful: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip

Yes. Waiting it would would be just fine. But, for safety purposes, just be sure to create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the upgrade.