There is a traditional way to solve the problem of how to sync files from OneDrive to Google Drive is by dragging and dropping files, which is a little bit easier than the most popular ways :
Step 1. Download the OneDrive client and finish the setup on your computer. (For Windows 11 and Windows 10 users, OneDrive has preinstalled in Windows, so you don’t have to download its app, just search OneDrive in the Windows search box)
Step 2. Open your Google Drive account in your browser.
Step 3. Open your OneDrive folder to select the files you want to transfer to Google. Then, drag and drop them into Google Drive.
Also, there is a way that would save your time and reduce the headache and this way is by using third-party tools that can transfer files directly, easily, and quickly like Gs Richcopy 360 and Syncback, So you don't have to download the files and uploading it again.