"Jeremiah is Old Testament where sins are only covered, not taken completely away and forgotten."
The OT sacrificial system -
All sanctuary sacrifices, whether offered daily or annually, pointed forward to the sacrifice of Christ on the cross.
Regarding the law, wouldn't a soft heart prevent you from sinning again?
Do you sin?
1 John 2
1My little children, I am writing these things to you so that you will not sin.
But if anyone does sin, we have an advocate before the Father—Jesus Christ, the Righteous One.
2He Himself is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world.
3By this we can be sure that we have come to know Him: if we keep His commandments.
4If anyone says, “I know Him,” but does not keep His commandments, he is a liar, and the truth is not in him.
5But if anyone keeps His word, the love of God has been truly perfected in him. By this we know that we are in Him:
6Whoever claims to abide in Him must walk as Jesus walked.
Revelation 21:27
But nothing unclean will ever enter it, nor anyone who does what is detestable or false, but only those who are written in the Lamb's book of life.
Rejoice, because your names are written in heaven (Luke 10:20).
But as we rejoice, we must also remember not to take the mercy of God and His grace lightly by trying to cover up or ignore our sins. They must be confessed and forsaken:
Rejoice, O young man, in thy youth; and let thy heart cheer thee in the days of thy youth, and walk in the ways of thine heart, and in the sight of thine eyes: but know thou, that for all these things God will bring thee into judgment (Ecclesiastes 11:9).
And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life (Revelation 21:27).
Sins that have not been repented of and forsaken will not be pardoned and blotted out of the record, but will stand as a witness against us in the judgment.
Sins that have been repented of and forsaken have been forgiven and will not be seen.
Judgement takes place before He returns.
Revelation 22
7“Behold, I am coming quickly. Blessed is the one who keeps the words of prophecy in this book.”
Revelation 22
12“Behold, I am coming quickly, and My reward is with Me, to give to each one according to what he has done.