I'm one of these postgrads who decided that if I were going to face the same politics in academia as I would in industry, I should be better paid.

Surprisingly, the politics are much less where I landed. Hard work, though.

The biggest issue I've both experienced and seen about 90%-95% of PhDs in industry I mentor is that crushing feeling of inadequacy at being the "expert" in the room. Imposter syndrome is real.

My primary bit of advice is to seek mentors that invest in you. This is true whether you are experiencing Imposter Syndrome or not.