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If you are still logged into your new UID, I recommend going to the User Center and trying to link your new account with a different email address. Then, once you change this, I would try to log out, and then log in using your old email address, which should still be associated with your old UID.
If you are using a Gmail address, one note is that it is possible that you might have linked your account previously using "Login with Google" in the past instead of just email, so that might be another way to try logging in to your old account.
You can also try logging into your Hoyoverse account through the Genshin website and seeing if that still has your old UID.
Otherwise, yeah, contacting support would be the best way.
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