I'm here to help you move your company data from QuickBooks Desktop to Online, @usergy.
Converting your data from the desktop to online is available for QuickBooks Canada, US, and UK versions.
You can start by creating a backup copy of your 9-year old company data before converting it to the latest version of QuickBooks Desktop. Here's how:
Once done, go back to the File menu and select Copy Company File for QuickBooks Online under Utilities. You can read through this article for the detailed steps: Move your QuickBooks Desktop file to QuickBooks Online.
I've also added these articles that can guide you more in converting QuickBooks Desktop file to Online:
Keep me posted if you need further assistance in managing your data in QuickBooks. I'm always here to help. Keep safe and have a great day.