I have never understood carpet bombing applications, why not go talk to managers and see what thy want to hear before applying? I’ve always had much better success when I go out of my way to see the needs of a company and tailor my applications/resume to their needs.
Fortunately I haven’t had to do this since my teenage years.
Once you have enough industry work under your belt, and a few good connections – you can typically traverse an industry with a good word and strong portfolio.