With 了： you are describing a status and/or an action that you are about to complete. Without 了：it can be a statement. 我要去上课了。I’m leaving for my class. 我去上课了。I went to class already. 我要去上课。I want to go to class. Or an an answer.

Here 了 means nothing, but it uses for completing the sentence, like a tone. if you remove it, it won’t change the meaning

你好啊，请关注我好吗？我是中国人

谢谢你们的回答