According to the information provided, it was impossible to determine the ending of the original work and where Fan Xian went in the end. But if you're interested in the topic of celebrating the New Year, I can recommend a few doujin novels. For example,"The Elegant Fan Sizhe in Celebration of the Past Years","The Control of the World in Celebration of the Past Years","The Usurpation of Power in Celebration of the Past Years", etc. These novels were all based on the foundation of the celebration of the New Year, and had been adapted and derived in different ways. I hope you like my recommendation. Muah ~