this happend you have already migrated your migrations.
But if you make some changes in migrations then you need to run this command:
The migrate:refresh command will roll back all of your migrations and then execute the migrate command.
This command effectively re-creates your entire database:
php artisan migrate:refresh
# Refresh the database and run all database seeds...
php artisan migrate:refresh --seed
The migrate:fresh command will drop all tables from the database and then execute the migrate command:
php artisan migrate:fresh
php artisan migrate:fresh --seed