The word "de spoil" refers to the act of ruining or destroying something. Some of the antonyms for "de spoil" include nourish, preserve, protect, conserve, and enhance. These words suggest a different approach to dealing with something, one that involves taking care of it rather than damaging or destroying it.
For example, if someone wants to de spoil a natural habitat, they might cut down trees or pollute the environment; but to protect it, they might plant more trees, create nature reserves or reduce pollution. Similarly, instead of de spoiling a relationship by harboring grudges or neglecting communication, one could enhance the relationship by expressing love and appreciation, and by being attentive and considerate towards the other person.