You may have 2 ways:
1. Request to Intuit
https://quickbooks.intuit.com/learn-support/en-ca/intuit-account/request-to-be-the-master-admin-or-p...
2. Backup option, if you are still able to login as Company Admin and the account is active (not canceled).
Open a new blank QBO account
https://quickbooks.grsm.io/CFIB
https://quickbooks.grsm.io/Canada
then utilize the trial version of the Copy feature available in a backup restore app to clone data.
https://rewindio.grsm.io/quickbooks
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