Yes, you are on the right track.
Since you said you had Windows 10 Pro, and I am going to presume that you installed this via the upgrade process (whether GWX or Media Creation Tool), that means that you had to have had Windows 8/8.1 Pro as your underlying base OS prior to the upgrade.
You should be able to download the latest Win10 ISO using the Media Creation Tool or Tech Bench and run a clean install of Windows 10. As John has already mentioned your license for Windows 10 for a given piece of hardware is stored on Microsoft servers and you are entitled to reinstall a clean copy at any point in time if you have an existing license. You will probably not even be asked about licensing if the installer queries the servers first, and I believe it does.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
Memory is a crazy woman that hoards rags and throws away food.
~ Austin O'Malley