Set priority on a task | Maximum order reached

You can set priority when there are too many tasks.
Do you see the orange triangle symbols on the things that you ordered your people to collect / move / make? Click on one of the orange triangles, then click on the little green circle next to the green arrow. So they will take this task as a priority.

If you see a yellow triangle, but there is no priority icon, then the problem is not in the load, but, most likely, in the absence of the necessary resources.