had best (do something)
should do something, ought to do something
I had best go home soon as I want to get up early tomorrow morning.
Worst Body Language Mistakes Job Seekers Make
Failing to smile
Reiman said smiling demonstrates confidence, openness, warmth, and energy
It also sets off the mirror neurons in your listener, instructing them to smile back Without the smile, an individual is often seen as grim or aloof, she explained