New title did Macbeth receives early in act one is Thane of Cawdor
Step-by-step explanation:
Right after Macbeth faces the witches who prophecize to him the imminent events which make him wary, Macbeth finds out that the King becomes compassionate to him and makes him the Thane of Cowdor after the old Thane rebelled against the crown and got hanged for it.
The new thane of Cawdor was a good position for him to have and confirmed that he is on his way up towards the crown which the witches prophesied for him. This made Macbeth believe the prophecy.