To complete and file a prior year (2021 thru 2023) tax return using TurboTax you would need to purchase, download and install on a personal computer one of the desktop editions for each tax year required from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A prior year tax return can only be printed and mailed, it cannot be e-filed using TurboTax. Use separate envelopes for each tax year when mailing.
Some paid tax professionals might still be able to e-file a past year tax return, but it cannot be done using TurboTax. If you want to use TurboTax to prepare your past year returns you will have to file them by mail. Each year needs its own separate envelope. Do not try to combine them in any way.