end vs end up 

TO END: 

I'd like to end (my letter/my speech/…) by saying that …

She ended her speech on an optimistic note.

At last, the war ended.

How does the story end?

The problems did not end there.

TO END UP: 

Cambridge Dictionary

Oxford Dictionary

• I wanted to study a Law degree, but I ended up studying Philosophy. 

• It was supposed to be teamwork, but I ended up doing all the work myself.

• Most gadgets end up in the trash; however, they should be recycled properly. 

• If you eat that, you may end up with food poisoning.