Istikharah is not a prayer to search for answer through dreams. Rather, if the journey towards what you look for is made easy or made more difficult, by Allah’s permission. If still unsure, do more istikharah until its clear as black & white & you don’t have any more doubt about the situation and the decision you have to make. InsyaAllah
The serenity & comfort you feel when your Istikharah is answered and you know exactly what Allah SWT wants you to do.