I will like to get back to my old iCloud account
I will like to get all my photos to the old account
iPhone 6s
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Merging Apple Accounts or transferring data is not officially supported, nor can it be done easily or completely.
Apr. 2018 post by ASC helper Winston Churchill on transferring data from one Apple ID to another. https://discussions.apple.com/message/33333380#message33333380
Feb. 2021 tips from Eric Root https://discussions.apple.com/thread/252468781?answerId=254653802022#254653802022
Look into using Family Sharing to continue to be able to use items purchased with one Apple ID with other Apple IDs.
Family Sharing - https://support.apple.com/HT201060
Set up Family Sharing - https://support.apple.com/HT201088
Fortunately when you sign out of one ID it asks you in most cases if you wish to retain the data from it on your device. Say yes and then delete individual items you do not want.