There are a lot of different ways to "bump" your question (or others that you're interested in). One way is to edit it adding more information, like documenting what you've tried, more data about the issue, etc. Performing minor edits just to bump your question will eventually make the question a Community Wiki and you'll no longer gain reputation on that question.
If you've added everything you possibly can, you have the ability to add a bounty to a question. This adds the question to a list of featured questions which users browse and answer frequently.