Phone/language skills instead of tech skills to land job

I’ve had about 4 phone screenings for jobs over the past 18 months. 1 resulted in a personal interview – the others never called back.

I think I lack good speech skills, and my lack of ‘big words’ may be hurting me.

Should I forget the tech skills and take a course on speaking? – most screens don’t go into detail on the techy stuff.