It's not possible to merge online TurboTax accounts. If you can't find any evidence of your prior return in an online TurboTax account (using the steps in the next paragraph below), you likely still have multiple accounts.
Log into your Online TurboTax, and in the left menu column go to the Tax Home. Then scroll down the Tax Home page to the section "Your Tax Returns & Documents." Expand that section and choose the tax year you want. Then you can choose to "Download/print the PDF", or if you just need the 2019 AGI, then once you choose 2019 there should be a link to "View adjusted gross income (AGI.)"
If you do all that, but there's no evidence of prior returns in that section "Your Tax Returns & Documents", then you likely have multiple accounts and signed into the wrong one. Many people end up with multiple accounts.
You can have up to 5 accounts that use the same email address for notification purposes. A User ID may be an email address, but it doesn't have to be. It might be only part of an email address, or it can be anything at all.
To get a list of your User IDs, reset password, and recover account access, etc., you can use the tool at the link below. When using the Account Recovery tool, try using your phone number first. After that, if necessary, then run the tool on your email address(es) you can access.
NOTE: Before running the account recovery tool below, log out of all Intuit accounts including this user forum, or you might end up in a loop. Then clear your browser Internet cache, close your browser, then reopen it, and go to the link below. You may wish to copy this link so you can paste it into the new browser session.
If still no luck after running that on your phone number and email address(es) that you can access, here's another method:
Go back to the tool again, but this time leave the data field blank, scroll down a bit, then choose the small blue link that says "Try something else", and it will look you up by SSN and other parameters.
You also said that last year for your refund you used a Turbo Card that you still have. Are you planning to use that again this year? If so, I don't know if you can. The following FAQ says you cannot if it's called "Turbo Prepaid Visa Card" as opposed to "Turbo Visa Debit Card", although it's confusing as to what tax year it is referring to, since it was written in September 2020.
In any case, whether you can use yours again this year might depend on whether your card is called "Turbo Prepaid Visa Card" (which was an older card) or "Turbo Visa Debit Card" which was a newer card last year, but I don't know about this year. I'm just a fellow user and do not work for TurboTax. You should talk to customer support at Turbo Visa Debit Card or TurboTax Support for definitive information before using your existing card.