It's so unfair to see people get jobs through referrals and friend recommendations while I'm here working so hard to prove myself and get a promotion. I feel there's no point to stay here anymore?

This is life, life is never fair

Maybe work on your communications skills. instead of turning the magnifying glass on them, use the energies to work on yourself.

Real world. Especially when you are climbing up higher management role.

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You would need the mastermind group :)

All the best

To be harsh, yes this is a childish mindset. Referrals and recommendations is the best way to get a job. my first job till now were all through recommendations and referrals. You get a better understanding of the company before you join, and through tips, you excel the interviews better.

if your efforts are not acknowledged, means you are either climbing the wrong tree, or your efforts are not loud enough.