Put away the plate
The meal is over but the body wants to stay in the chair, and getting up to reach the cupboard breaks a cosy moment. Soften that ending with the picture step below.
♀Put away the plate
A girl places a clean plate into an open kitchen cupboard.
About this visual support
The meal is over and the mood is comfortable, but that is exactly the problem: getting up to carry the plate to the cupboard breaks a moment the body would rather stretch out. The transition becomes a small threshold, and with nothing to aim at it is easy to stay seated until someone asks one more time.
Visual support makes the short stretch between table and cupboard visible and predictable. When the child sees that the task has a clear start and a clear end, starting gets easier, because the brain no longer has to weigh this-is-nice against get-up-now in the same second. The picture takes over the reminding, and you do not have to repeat yourself.
One concrete tip is to tie the plate to the same spot every time, a set shelf or the left corner of the counter, so the end point always looks the same. The action then becomes a habit rather than a fresh decision at each meal. In Routined you can place this as the final step of the mealtime routine, so the ending belongs to the eating.