what do you mean lost? if you are using a desktop version there is the original return and a backup that starts with a ~. here's how to find it if it still exists. this link is for 2019 so substitute 2020. however, if your hard drive failed the file is probably not recoverable. there is no online backup
https://ttlc.intuit.com/community/taxes/discussion/i-can-find-my-turbo-tax-2019-file-file-on-my-comp...
if you're using online the file is there. you may have signed into the wrong a/c. many taxpayers have multiple accounts. use the a/c recovery tool.
https://myturbotax.intuit.com/account-recovery/
