Is it legit to delete and repost a question that gets no answers, even if the bounty has expired and no one answered, although there were comments before the bounty? I have one such question. I am still trying to resolve it, but I don't know what else I should look for.
It is legitimate to delete and undelete a question, but it has no effect (it won't be bumped to the frontpage again).
Deleting and reposting the question is not allowed; that would amount to just bumping the question. If you do that too often, you'll attract attention of the ♦ moderators who might want to have a word with you.
In relation to questions that are relevant to more than one site; It is acceptable to delete and re-ask on another community's site: