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You can use the cutom URL in the Thank You page to auto redirect the form after submission to another URL -- in your case you can just use the URL of your website http://www.gustavomaia.com.br/contato1.htm
the form URL itself http://form.jotformz.com/form/41196687355668
I checked your form, and I think you had this figured out already. I see this in your form Thank you page
Just in case also what you wanted to happen is display first Thank You message, then auto-redirect back to another URL.. then follow this guide
Inform us if you need more assistance.