I am committed to learning English.
I am committed to playing tennis every week.
We don't normally use "doing" after "devote".
I'm devoted to my husband.
I'm devoted to my dog.
However, we might use verb+ing after it:
I'm devoted to acting.
Remember, you can also "devote time" to something.
I'm going to devote five hours a week to learning Spanish.
Student or Learner