If in the physical world blood is so relevant, how much more is The Blood relevant in the spiritual where the blood could even speak to the heavens?

Yes curses do exist, but the blood of Jesus has been granted to us for redemption from all the curses and we receive deliverance from every curse by putting faith in Jesus' resurrection.

The Spirit of the Lord is upon Me, Because He has Anointed Me To preach the gospel to the poor; He has sent Me to heal the brokenhearted, To proclaim liberty to the captives And recovery of sight to the blind, To set at liberty those who are oppressed.

Everyone requires deliverance, as we're all born sinners. Deliverance is part of Jesus' ministry as He dwelt among the flesh in Human form as we see in Luke 4:18-19 "The Spirit of the Lord is upon me, Because He hath anointed me to preach the gospel to the poor; He hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised, to preach the acceptable year of the Lord."