'You shall be holy.' The list that follows is almost entirely about how we treat other people.
Kedoshim contains the Torah's most famous ethical instructions: leave the corners of the field, do not stand idly by, love your neighbor as yourself. Holiness here is not vertical retreat, it is horizontal responsibility.
The parshah refuses the split between spiritual and ethical. There is no path to the Divine that avoids the person in front of you.
This week, pick one instruction from Kedoshim and live it literally for seven days. Notice what it costs and what it opens.