"没什么可说的了" can be translated into English as:
1、 "There's nothing more to say."
This is a straightforward and commonly used expression.
2、 "I have nothing left to say."
This conveys a similar meaning, emphasizing that the speaker has exhausted all they wanted to communicate.
3、 "That's all there is to it."
This phrase can also be used to indicate that there's nothing further to add on the matter.
Among these options, "There's nothing more to say." is perhaps the most direct and commonly heard translation in everyday conversation.