Teaching pronunciation is a speciality. A very few teachers have training in English phonology and in articulatory phonetics (the study of how the jaws, lips, tongue, and vocal cords create sound).
I used "Find a Teacher" on the website with the filters "English," "native speaker," and "pronunciation" and found about 500 teachers and tutors who mentioned pronunciation in their profiles.
I changed the filter to "phonology" and found seven teachers and tutors.
I changed the filter to "articulartory phonetics" and found one teacher.