Your options are very limited. You will still be able to use QBD 2019 after May 2022 but you will not be able to use any online services (eg payroll, bank feed). If $350 is too much to buy a new QBD Mac Plus 2022, migrating to QB Online is another option.
https:// quickbooks.grsm.io/US
https:// quickbooks.grsm.io/us-promo
