I cannot reset my old apple ID
How to reset apple ID and changed a new one
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What do you mean by "reset"?
Forgotten password:
If you forgot your Apple ID password --> https://support.apple.com/HT201487
Change a known password:
Change your Apple ID password --> https://support.apple.com/HT201355
What to do after you change your Apple ID or password --> https://support.apple.com/HT204071
Why it is better to resolve an issue with an old ID -->
Click on this link for Apple ID Frequently Asked Questions --> https://appleid.apple.com/faq
How many Apple IDs do I need?
Just one. Use the same Apple ID everywhere you sign in to ensure that all your Apple services and devices work together seamlessly and you can access your personal content from all your devices.
Click here to see how to 'Create an Apple ID' = create an Apple Account. --> https://support.apple.com/HT204316
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