[cellu]

I tried that too e.g. messaging talent recruiter managers on LinkedIn - never got a reply or “accepted” to start chatting

[GreenWatermelon]

No no, literally literally knocking on doors. Go to a company's office and ask of they have a job.

[ghaff]

It depends on the type of job. The receptionist at Google or IBM or wherever is going to give you a URL at best.