See this question on the "mother meta" site which rob linked in a comment. Basically, these are your options, roughly in the order I recommend trying them:
- If it were someone else's question, upvoting it would help, but that's not applicable here.
If you have edits that legitimately improve the question (for example, by clarifying it), you can edit the question, which will bump it up to the top of the front page of the site. This is particularly relevant when people have answered your question but the answers are not satisfactory: you can edit to make it clear what you're really looking for in an answer, but in a way that doesn't totally invalidate the existing answers.
Don't go overboard on this; you probably shouldn't be editing your own post more than 3 or 4 times total. But you can strategically choose when you edit to give the post more attention.
- You can ask about it in chat, if you have access to chat (requires 20 reputation total across the SE network). You might find someone who can answer your question, or you might get suggestions about how to improve it so that another person can answer it. (Or both.)
- You can share the question outside the site by using the "share" link underneath it.
- You can offer a bounty on the question, which places it in the featured questions list. Or perhaps you can find a high-reputation user who will be willing to place a bounty on it for you. Just don't be pushy when you ask about that.
As the mother meta post says, do not repost your question again. We try hard to avoid duplication of questions. And especially don't do anything that makes it seem like you're trying to get around the rules against duplication - for example, if you delete your first question before reposting it, or if you continue to make duplicate posts after being told that you shouldn't. (Not that I think you would, but people do try it sometimes.)
Note that asking a separate followup question is a different story. If you have a followup question - and it has to be a different question - then you can post that separately. In such cases it helps to link to the original question and explain clearly how the new one differs.