Moving chickens to a larger coop, what to do after 40 days - Chicken Farm

Moving chickens to a larger coop, what to do after 40 days/chicken farm. I have a coop about 12 square meters. I usually let the chicks roam for the first 15 days when the chicks hatch. Because this coop is very warm in the winter. After 15 to 20 days I will move the chicks to another cage. Bigger barn to continue breeding until sold out #chickenfarming #chicken #babychick