我整理出了一封比较符合你情况的辞职信，希望能帮到你。
Dear 领导,
I would like to inform you that I am resigning from my position as 职位. My last day with the 团队名称 will be 期待离职日.
Thank you for the professional and personal development you have assisted me with over the last 任职时间. Due to personal reason, after long time consideration, I feel is time to move onto new opportunities and challenges. However, I consider just about everyone I have met here to be friends of mine now, and I will miss you all.
Please keep in touch. If I can be of assistance during this transition, please let me know. I can be reached via email at 邮箱.
Sincerely,
你的名字
Dear Mr XX,
I am sorry to tell you that I have decided to resign from the company after XX years work with you. This is a very difficult dicision for me; however, after careful consideration of my future career I choose to join a newly started US company as a Purchasing manager.
I have learnt a lot from you during the past few years and I really appreciate all your help and support. Nevertheless, I think it is the time for me to switch to a more challenging role. The US firm, although much smaller, could provide me more opportunities and flexibility in my career.
I am sorry if I have let you down by leaving at such a time, but I hope you could understand my decision. I sincerely wish you and the company all the best and lets keep in touch.
Regards
XX.
