I would suggest that you familiarize yourself with the site as well as the Stack Exchange model: the site tour and the help center will give you guidance on how to use this SE site (and others).
This will give you an idea of what you can do at your present rep level, and what you can look forward to with more.
You cannot vote on your own question, though I believe with enough rep, you might be able to vote to close. Closed questions are subject to removal.
Remember, once you post a question or answer on an SE site, your post kind of becomes community property, to edit, delete, etc. Your "ownership" over it ceases once the community interacts with it in a significant manner. To shut down potentially better answers takes something away from the community which invested in the answer.
If you are not comfortable with the idea of your contributions being collaboratively edited by other trusted users, this may not be the site for you.
That also applies to closing, answering, etc. etc.
If so, then I propose to edit the question and state clearly that no more answers or comments are being sought. Would that be kosher?
Since it neither chews its cud nor has split hooves, technically, no.*
Trying to change the SE model is a fruitless pursuit. (It isn't broken. It isn't implemented perfectly, but the model is just fine.) It would be better to properly use the system in place than to try to mold it to your desires.
*I totally stole that from someone wittier than me.