Financially, if possible, fathers can help. Say, if the daughter wants to take some special classes related to her dream career. Fathers can also introduce their daughters to people in the fields they are interested in. If the daughter is into science, the father can arrange for her to meet a scientist he knows. This can give her more inspiration and knowledge about what she wants to achieve.
Fathers should encourage their daughters to be brave and take risks in pursuit of their dreams. Let them know that it's okay to fail and that they will always have his support. He can share his own experiences of facing challenges when he was young and how he overcame them. This will give the daughter more confidence to go after what she wants.
Fathers can listen attentively when their daughters talk about their dreams. Just by being there and showing that they care is a big support. For example, if a daughter dreams of being a dancer, the father can attend her dance recitals.