After announcing that he was Iron Man, the government wants to take his suit away from him. They believe that he is not dependable and they want to put the advanced technology in someone else. Tony doesn’t agree with this. So, Tony refuses to hand over his technology.
After Avengers: Infinity War, Thanos killed half of all the living beings. Half of our favorite heroes died and half the Avengers are left to move on. Some people try too, but it is hard for our heroes to move on.