There is a misconception where teachers are saying this verse states the law is now useless to us and is not relevant to us since righteousness is given to us through Yahushua now.
This verse is not saying the law is now void, it is just saying we can now gain righteousness through Yahushua the Messiah, and that righteousness is not through our keeping of the law, this is great for us because we have all sinned and we can not obtain perfect righteousness through the law.
So if we had to rely on the law for righteousness then we would all have to be put to death since we have slipped up.
Romans 3:21 "But now the righteousness of Elohim without the law is manifested, being witnessed by the law and the prophets, even the righteousness of Elohim which is by faith of Yahushua the Messiah unto all and upon all them that believe, for there is no difference. For all have sinned, and come short of the glory of Elohim"
If you follow the context of this letter, you can clearly see the law is to be kept and Paul here is just sharing the good news that we are pardoned for our iniquities being gifted righteousness! We desperately needed that gracious gift because we have sinned against the law of YHWH!