To fullfil wishes one has to make Gods/Goddesses joyous. This is very difficult without production procurement and presentation in a form applicable to deity.
To fullfil wishes one can loose some assets of his own.
To fullfil wishes one can eliminate enemies who blocked it by a method called abhicharika prayogam.
To fullfil wishes one can take more efforts and dedicate a portion for Godly activities periodically by sankalpam.
But wishes are a level below happiness and Divine attributes of a holy person.
YOU CAN WISH within limitations only.