Jesus is my Sabbath rest. Just as God rested from His works, so we rest from ours in attempting to gain salvation. Somehow this eludes you; you think you can put yourself under the law without being condemned by the law, which you cannot keep perfectly. The Law made nothing perfect. The Law was our tutor to lead us to Christ, so that we may be justified by faith. If righteousness comes through the Law, then Christ died needlessly. If you are led by the Spirit, you are not under the Law. Sin shall not be master over me, for I am not under law but under grace.
Children saved by God's grace, in their faith in God the Son, try to be obedient to the commandments, the will of God the Father, Son and Holy Spirit, and repent where they fall short in sin.
To rest all seven days, is being disobedient to God the Father, Son and Holy Spirit, commanding us to work for six days.
If you understand Paul, to mean a free pass to unrepentive lawlessness, read your misinterpreted warning from Peter, in 2 Peter 3:14-18.
Revelation 14 (KJV)
12 Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
John 15 (KJV)
10 If ye keep my commandments, ye shall abide in my love; even as I have kept my Father’s commandments, and abide in his love.
Deuteronomy 5 (KJV)
12 Keep the sabbath day to sanctify it, as the LORD thy God hath commanded thee.
13 Six days thou shalt labour, and do all thy work:
14 But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, nor thy manservant, nor thy maidservant, nor thine ox, nor thine ass, nor any of thy cattle, nor thy stranger that is within thy gates; that thy manservant and thy maidservant may rest as well as thou.
15 And remember that thou wast a servant in the land of Egypt, and that the LORD thy God brought thee out thence through a mighty hand and by a stretched out arm: therefore the LORD thy God commanded thee to keep the sabbath day.
2 Peter 3 (KJV)
14 Wherefore, beloved, seeing that ye look for such things, be diligent that ye may be found of him in peace, without spot, and blameless.
15 And account that the longsuffering of our Lord is salvation; even as our beloved brother Paul also according to the wisdom given unto him hath written unto you;
16 As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction.
17 Ye therefore, beloved, seeing ye know these things before, beware lest ye also, being led away with the error of the wicked, fall from your own stedfastness.
18 But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and for ever. Amen.