How can I ever express my thanks to you for all you've done?

对你所做的一切，我怎么才能表达谢意？

《牛津词典》

I want to express my thanks to you for coming again!

我想对您再次光临表示感谢！

youdao

My thanks to you are beyond any expression.

我对你的感激之情无法用言语表达。

youdao

My thanks to you and the men and women of this magnificent agency.

WHITEHOUSE: President Obama Thanks the Intelligence Community

"My thanks to all of you, and now, it's on to Chicago, and let's win there, " Kennedy told his supporters.

CNN: Remembering Bobby Kennedy Thirty Years Later

My heartfelt thanks to all of you who helped me win this nomination and stood by me when the odds were long.

CNN: McCain: Change is coming