既然是"提携"应该是感谢他让你升职,得到好的机会之类吧,不管如何,恭喜LZ先
由于不知道细节,只能将梗概大概写下,剩下的就靠你自己去扩充了.
Dear Mr. XXX,
I really appreciate your consideration and giving me such a valuable oppotunity of promotion. I like the new change as well as the challenges brought by it. Without your help, I wouldn't make such a great progress.
接下来谈谈你对新职位的打算等,几句话就可以.
Thank you again for you help. I am looking forward to cooperating with you again before long.
Best regards
Yours sincerely
XXX