Sending messages on LinkedIn asking for a job?

Hey everyone! I've been planning to send LinkedIn messages for people on LinkedIn who are 'experts' in my field in specific companies I would like to work at. For example, briefly making a self-presentation and asking more infos about their roles/daily tasks in the company and 'offering' myself to work there.

I know this strategy is a growing tendency, so I'd like to know if you've ever tried to do this? And any tips and tricks? What's your opinion about this technique?

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