The best workaround I found, especially for a folder with a large number of files, is to download and re-upload the folder. Here is how you can do it. Download the folder from your organization's Google drive. The folder will download as a zipped file. Once on your computer, you can unzip it, and simply throw the resulting folder with the same name back into your personal Google drive. It will upload and all the files and subfolders will be owned by you.

The only downside of this is that you will lose the timestamp for your files, but you will have full ownership of your files.

The best workaround I found, especially for a folder with a large number of files, is to download and re-upload the folder. 

Here is how you can do it.

• Download the folder from your organization's Google drive. The folder will download as a zipped file.
• Once on your computer, you can unzip it, and simply throw the resulting folder with the same name back into your personal Google drive. It will upload and all the files and subfolders will be owned by you.

The only downside of this is that you will lose the timestamp for your files, but you will have full ownership of your files.