Need Regex Help For Complicated Query String

I need some mod rewrite help with a regex.  This is an example url - https://www.thefrugallife.com/12all/lt.php?c=1728&m=2981&nl=1&s=c9b91a7ca200a96e668e515ecf49b34c&lid=19221&l=-http--www.theherbsplace.com/Shop_A_Z_page_1_c_28.html

I am trying to get it to redirect to the url after the last equals sign - http--www.theherbsplace.com/Shop_A_Z_page_1_c_28.html

I have 2,000 links like this all with a different url after the last equals sign.

Here is my code

RewriteCond %{REQUEST_URI} /?12all/lt\.php$
RewriteCond %{QUERY_STRING} c=(.*)$ [NC]
RewriteCond %{QUERY_STRING} m=(.*)$ [NC]
RewriteCond %{QUERY_STRING} nl=(.*)$ [NC]
RewriteCond %{QUERY_STRING} s=(.*)$ [NC]
RewriteCond %{QUERY_STRING} lid=(.*)$ [NC]
RewriteCond %{QUERY_STRING} l=-http--(.*)$ [NC]
RewriteRule ^.*$ https://%6/? [NC,L,R=301]

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Please tell me what I am doing wrong so I can get this cleaned up for Google.

Thanks,