You can "bump" your question by editing it to provide status and progress updates resulting from your own continued efforts to answer the question yourself, or to explain why the existing answers didn't work. I usually do that unless I really hit a dead end with no further clues to follow. Sometimes I eventually bring about enough understanding to realize the answer, and then post a self-answer to my question.
If you have at least 75 reputation, you can offer a bounty, promising to give some of your reputation to a user who answers your question. This causes your question to receive additional attention, as it will be added to a special list and be promoted more than normal questions.
If there is an unsatisfactory answer, you could leave a specific comment on that answer to ask for clarification or suggest an improvement to clear up anything you don't understand.
Post a link to the question on the site's chat. Usually active users of the site will hang out there, and they can offer further help.
Use the share button beneath your question to advertise it to your networks. Then, if you find the answer, you can post a self-answer to help others who come across the same question.
Do not post your question a second time, as it will be closed as a duplicate of your first question, and may attract downvotes. Also, do not delete your question and re-ask it, as your previous question will be undeleted and your new one closed as a duplicate.