Using a shotgun approach to job hunting rarely works well.
shotgun approach
idiomAn approach in which the subject is indiscriminate and haphazard, using breadth, spread, or quantity in lieu of accuracy, planning, etc.
The marketing team used a shotgun approach, sending emails to thousands of people who were not interested in our product.
Rather than refining his research to target specific demographics, the professor employed a shotgun approach, gathering vast amounts of data in hopes that something significant would emerge.