We should understand the difference between Yenika [suction/nursing] to the Klipa [shell/peel] and Kedusha [holiness], which is the prohibition between the part that is given to the Sitra Achra [other side], which is permitted,… (Rabash, Notes 232 “Bribing the Sitra Achra”)

The Sitra Achra is the desire to receive and enjoy something material, which is opposite to the desire to give everything to others and the Creator. All our desires are not yet spiritual.

Question: What is the role of the Sitra Achra in spiritual work? You cannot live without it, but you must give something away so it does not interfere.

Answer: Yes, that is how it should be. When we have no choice and we have to give some of what we have to the Sitra Achra, then it does that, and we can do the work of moving toward holiness.

Question: How do we determine what can be given away and what cannot?

Answer: It depends on the person. One must decide which part he takes for himself and which part he leaves for the Sitra Ahra. He must know where he can think about the Creator. And the part that he cannot take for himself since he is sure that it is included in his receiving Kelim, he gives to the Sitra Achra.
[332343]
From the Daily Kabbalah Lesson 7/21/24, Writings of Rabash “Bribing the Sitra Achra.”

Related Material:
Get Rid of the Klipa’s Power
Cursory Thoughts On Shamati, “What Does It Mean That The Sitra Achra is Called ‘Malchut Without A Crown’”
Separate Purity from Impurity