Do you lose any data if you change your apple ID
do you lose contacts, messages or any other data when you change your Apple id.
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If you want a simple answer, yes, you do lose data. The data will remain on the ID but if you're not using that ID you won't have access to it.
If you want more detailed information about what you can and cannot transfer and how, read the links below.
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