3句英文任你选

I've made a tough decision, sir. Here is my resignation.
老板，我做了一个很艰难的决定。这是我的辞呈。

I quit because I don't want to be stuck in a rut. I want to move on.
我不想陷入案臼所以才辞职。我希望能向更高的目标迈进。

First of all, I'd like to say that I've really enjoyed working with you. However，I think it's about time for me to leave.
首先，我要说的是，我真的很高兴能与你共事。但是，我觉得该是我离开的时候了。

半个句型要记牢

be stuck in a rut (循规蹈矩，落人案臼)

Tip: stuck 即stick的过去分词，意为"粘住" rut是指"老规矩所以这个短语表示"停滞不前"如 We are kind of sticking in a rut. (我们有点陷入单调乏味的生活方式了。)