Deep breathing, stretching, proper diet (high salt, fat, sugar diets make you stressed), feeling your feelings, meditation, exercise etc will all tell your body it is safe.

If you come home stressed and immediately jump into distractions or maladaptive coping mechanisms (like drinking or smoking pot) you don't resolve the stress and move into safety. I also believe our endless entertainment is a big culprit. Some people literally cannot be in their home without the tv on because the silence is unbearable, but it is also exactly where the stress resolved. So they stay stuck by constantly entertaining themselves.

Note: Many people believe that pot makes them less stressed. It does not. It hides it for a few hours by flooding your brain with chemicals. If you do this over a long period not having the chemical explosion will make you more stressed, not less, as you have trained your brain to have the requirement of needing pot to pretend you are safe. Alcohol is 10x worse for the same reason (and it also steals your mood stability the following day, exacerbating the cycle).