Simping template applied, here are several variations that can be interchanged to suit different relationships, positions, and levels of seniority.

Happy New Year! Wishing you great luck and continuous progress. Thank you for your careful guidance and care over the past year, which has helped me improve steadily at work. The Year of the Horse is approaching; I look forward to continuing to ride forward under your leadership, forging ahead with determination.
As the new year begins, I am grateful for your guidance. Your advice over the past year has been truly rewarding. Wishing you a prosperous Year of the Horse, rising higher and higher, and may your family be healthy and happy.
The Spring Festival is here. Heartfelt thanks for your support and mentorship. Wishing you a smooth start in the Year of the Horse, with blessings and prosperity always by your side. May your family be united and joyful, worry-free.
Hello, leader! Happy Year of the Horse. It’s a great honor to learn and grow within your team. Thank you for your ongoing cultivation and trust. Though I don’t always express it, my gratitude is always in my heart. Wishing you good luck in the Year of the Horse, a thriving career, and steady progress upward.
As the Year of the Horse arrives, I sincerely thank you for your careful guidance and selfless help. I am fortunate to move forward under your leadership, feeling warm inside. Happy New Year! Wishing you health and happiness for your family, and may your career soar like a swift horse, creating new brilliance.

Director, I am deeply honored by your profound care and attentive guidance.
At this New Year, I wish your family happiness and continuous elevation! May the new year bring better words than the last. Looking forward to working hand in hand with you!