Why don't recruiters call back?
Millenials aren't getting hired quicker because they are young and cheap.... ( Read Below)
Generally recruiters do NOT follow up with candidates they can not place.
They likely know they can't market you!
If your recruiter gives you advice, take it!
It's because they aren't afraid to work with the job market's current technology! If you are applying to roles with an outdated resume, the process will take forever!
Recruiters are paid by organizations when they make placements. If your recruiters tells you how to improve your odds, TAKE THE ADVICE.