You can interest a man (woman) in various ways, here are a few of them:
Show your interest. Be active and proactive in communication. Ask interesting questions, show your interest in his life, hobbies and opinion.
Be confident. Men are usually attracted to women who are confident in themselves and their abilities. Be calm and confident, don't be afraid to show your personality and be sincere.
Show your mind. Be a smart and erudite woman who can keep up a conversation on various topics. Men appreciate women who can be their companions in mental development.
Be caring. Show care and attention to the man. Be attentive to his problems and interests, support in difficult moments.
Learn to listen. Learn to listen carefully and understand a man. Give him the opportunity to express his thoughts and feelings, show that you are ready to listen to him and understand.
But most importantly, remember to be yourself and don't try to play a role that doesn't suit you. Find common interests and respect each other's personal space.