In the good ole days, ha, my mother had a large mirror off a dresser. She put it up to a wall and the baby bed up to it. The baby saw itself and kept the baby busy, while mom saw dad off to work and us kids getting ready for school and to meet the bus. The beds had the bars/slats. I guess it worked, because that was the 6th child that I recall.
Sometimes it is cold turkey to let the child cry. That is fine. They are not hurting, just getting your attention. After awhile they should get the idea. Maybe set an alarm clock. When the clock goes off, then pick up the baby. They might get the idea.