On this page of the guide to Death Stranding, you will find a solution to the potential problem with the lack of new main orders in the hero's journal. You will learn how to determine where to go next to continue the campaign.
For the majority of the campaign, each new main order (orders for Sam) begins in the same location in which the previous one ended - the one where you have delivered the last cargo. However, this isn't the rule - some main missions may start in a completely different location or don't appear in the orders list at all.
After you finish a given order and check all the summary screens, the information on where to go next will appear at the top of the screen. This message will also be visible after you pause the game.
In our example, we had to return to the distribution center. You always need to find the specified location on the map and get to it on foot or, if the game allows, by using a fast travel.
This can also cause the game to display the next objective without adding a new order to the log. This usually happens when you need to perform some activity within the same location. In the above example, we had to complete the trip to the port after reaching this location.