So I’m in agreement with the people that say the shadow people are likely Djinn, which are Mortal, noncorporeal beings that are often portrayed as wisps of smoke. The general understanding is God made them from a smokeless flame before humanity. They have plenty of freewill in terms of their actions so for some reason they don’t always react to the name of Jesus as a demon or angel would.
For that reason I ask God and his mighty angels for protection. And I ward my home. Smoke em out with Palo Santo wood, and keep em out with a border of blessed salt or chalk (I get mine from powdered eggshells).
To top it off I just fill the home with good vibes. Bring friends over, blast music, keep the good vibes in. Remember these things feed off negative energy, especially fear and anger. So keep your head up