Please delete all previous posts except last thread

Dear Admin,

Lots of changes in my life and I really would like to delete all threads I have previously started as well as all previous posts, with the exception of my last thread.

Is this possible?

I can go through my posts and edit one at a time but even then, I cannot delete my threads, so I end up entering some jibberish like 'asdfasdaj' in the body of the post. But this does not seem fair to others on the forum and also it is a big time sink.

can you please delete all my posts except for my last thread?
thank you