“For all who rely on works of the law are under a curse; for it is written: Cursed be everyone who does not abide by all things written in the Book of the Law and do them.” (Galatians 3:10)

Why?

Read carefully: You’re only “not cursed” if you do “all” (not most or some) part of the Law for those who ‘wish to keep it’ under the New Testament era.

Good luck.

P/S:

You don’t ‘observe’ the ‘Law’ unless you’re “relying” on it (“no” other reason under the New Testament).