I asked a question previously on Math.SE. Halfway through the question, I realized that I might have found a solution. So I deleted the question, tried the solution; it didn't work. Now I wish to restore the question so others can try answering it -- but, it's gone. It's not even in my record of Posts. How can I restore it?
One can find one's own recently (last $60$ days) deleted posts via a link
at the bottom of the "Questions" or "Answers" tab of one's profile. (This link is only visible to the profile owner and moderators, it's nobody else's business. The link above uses the Id of the Community ♦ bot, it won't work. Replace the "-1" with your own user number – or go via your profile.)
If the post has been deleted for longer, and your reputation is below $10$k(1), you cannot locate it yourself (unless you find a link e.g. in your browser history). But if you ask nicely and provide enough details to make the search not too difficult, you may convince a moderator to locate it and provide you with a link to the post.
(1) Users with $\geqslant 10$k reputation can search for their own deleted posts with the search parameter "deleted:1" (or "deleted:all" to find the posts matching the other search parameters whether deleted or not).