Please, I need a batch to delete all folders, except specific folders, and specific sub-folders

I have a SSD with several partitions.

I need to work at J:\ and I need to delete everything inside J:\, except the following folders:

J:\System Volume Information  
J:$RECYCLE.BIN  
J:\New  
J:\Old Stuff  

And the following sub-folders:

J:\Papers\Folder  
J:\Room\Main Documents  
J:\Year\Origin\Part  
J:\Year\Origin\Part Two  

After reading a lot, I wrote:

@ECHO OFF 
SETLOCAL 
SET "sourcedir=J:\"
SET "keepdir=System Volume Information"
SET "keepdir=$RECYCLE.BIN"
SET "keepdir=New"
SET "keepdir=Old Stuff"
SET "keepdir=Papers\Folder"
SET "keepdir=Room\Main Documents"
SET "keepdir=Year\Origin\Part"
SET "keepdir=Year\Origin\Part Two"
FOR /d %%a IN ("%sourcedir%\*") DO IF /i NOT "%%~nxa"=="%keepdir%" RD /S /Q "%%a"
GOTO :EOF

Unfortunately, the code above deletes everything inside J:\.

One simple solution would be to use robocopy which is part of Windows:

md J:\empty
robocopy /mir J:\empty J:\ /xd keep /xd keep2

This will mirror an otherwise empty directory into the target, thus deleting everything. EXCEPT for those paths listed as exclusions (/xd path).