Your data is stored by your email/Fitbit ID. If you added the Charge 5 to the same account, your data should still be there. If you don't see your historic data, it probably means, you created a new account with a different email.
When you added the Charge 5, it should have noted you already had a Charge 3 connected and asked if you wanted to replace that. If it did not ask that, that means you created a new account.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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