Reports & Analytics and Data Workbench won't be available after December 31st, 2023.
Here are the resources for transitioning from Reports and Analytics to Analysis Workspace.
https://express.adobe.com/page/6WnF8JK6IRDhf/
FAQs for Data Workbench:
https://experienceleague.adobe.com/docs/data-workbench/using/eol.html?lang=en
Thank you for posting this, I am sure there are a lot of people who will find this useful as that deadline approaches!