A questioner asks a very important question, do we get rewarded for reciting Quran in our mind or must we recite aloud to get rewarded?
Reciting the Quran is an act of worship. It is one that is rewarded generously by Allah. Thinking about the words in your head does not count as reciting the Quran.
When we recite Quran it has to be pronounced with the mouth and tongue.