For those who have applied for hundreds of jobs/internships, where did you even find them?

I’ve been looking online for an engineering internship, but out of all the websites (SEEK, Indeed, and the jobs recommendation from uni) there are less than 10 opportunities in total, even accounting for entry-level mechanical/mechatronics engineering. I have heard people applying for hundreds on this sub, and not only do I admire your dedication, but where did you even find that many positions to apply to?