You may have to eat them. This time of year everyone want to find homes for extra roosters. There aren't enough homes unfortunately. You could list them free for the taking. Most will be eaten anyways so I always figure it's best they get used here for food instead of the stress of going elsewhere.
You can try posting signs, with photos, at local feed stores, or if there's a nearby auction, take them there.
Once they leave your property, they take their chances.
Do be careful about allowing any other people who have chickens on your property! Either arrange to meet elsewhere, or ask them to wear totally clean shoes and clothes, and hope that they do. Biosecurity!
I do take some to the local auction, and write notes on the cages, and 'talk them up', rather than just leaving. It helps, and many, but not all, do find homes other than the freezer.
You can build a separate coop for the extra cockerels too.
aart says, "It's where romance meets reality" in poultry keeping. True!
Home grown chicken is delicious!