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Maybe you can use it to write a new book: 101 Uses for a Dead Website. I'm not sure it's been written yet. :)

I'm just thinking that if you relax and use it casually you may build some value that you can leverage later on, or you may find some other idea to work it into.

You can always undo a 301-redirect...

I would turn it into an eclectic blog that wanders across the topic map without focusing on keywords. A better solution may eventually come to you before you sacrifice all the value.