Hello, duanechen2001.
It would help if you share with us what limitations there are for choosing the program. If you are not limited by form or epoch, there must be a time limitation? If you could share more about this, I am sure some of us here can suggest more concrete ideas.
Having a Romantic program is not a bad idea, but you need to always look at recital programs like movies or books - they need to have a story with a plot, many twists and turns, many contrasts. I suggest thinking about including music from other periods as well.
Best regards,
Dino