Here are examples of the word/phrase "endeavors" used in a sentence and paraphrased in a sentence...
I made several endeavors to meet with her but she was too busy.
I made several attempts to meet with her but she was too busy.
In all of my recent endeavors, only once did I come close to achieving my goal.
In all of my recent attempts, only once did I come close to achieving my goal.
I am extremely confident in my future endeavors.
I am profoundly confident in my future attempts.
Other Examples...