Jesus in Matthew 24 does not instruct anyone to keep the Sabbath. Matthew 24:20 does imply that the people in Judea will be keeping the Sabbath before His coming.
Paul says that keeping days (which includes the Sabbath) is up to the individual believer.
Romans 14:5 One person esteems one day above another; another esteems every day alike. Let each be fully convinced in his own mind.
If you were to carefully and prayerfully read all of Romans 14 you will notice it never says the Sabbath. This is not a reference to the seventh day Sabbath that God deems above all other days Genesis 2:1-3, Exodus 20:10, Isaiah 58:13. If you look at the context of Romans 14 it has nothing to do with the Sabbath commandment. Plus, if you look at the entire bible context you will see there is no scripture stating the Ten Commandments have ended up to the Second Coming of Jesus and furthermore the Sabbath in particular is still the day of worship in heaven Isaiah 66:23 so obviously you have a great misunderstanding of the holy scriptures. If the goal is to be with Jesus for all eternity, we should carefully follow the scriptures.
The Ten Commandments is God's law. God wrote it with His own finger on stone Exodus 31:18 God spoke it with His own voice Exodus 20 they came in a unit of Ten Exodus 34:28 and God's law is something that was given before sin Romans 4:15 so God's law is in heaven and from the very beginning because Lucifer sinned and was thrown. We already know God's law is in heaven Revelation 11:19 as it was placed in the ark of the covenant in the Most Holy of God's Temple under His mercy seat where He dwells. I don't think God is going to be okay with people selecting the commandments they wish to keep in heaven and God will is the same for us on this earth as it is in heaven.
Lets see what the scripture says about God's commandments.
Exodus 20:6 but showing mercy to thousands,
to those who love Me and keep My commandments.
Right in the Ten God sets the precedence that we should keep His commandments through love. Also note, it is those who keep them God shows mercy to.
Ecclesiastes 12:13
Let us hear the conclusion of the whole matter:
Fear God and keep His commandments,
For this is man’s all.
14 For God will bring every work into judgment,
Including every secret thing,
Whether good or evil.
Paul says something very similar
1 Cor 7:19
keeping the commandments of God is what matters.
There are many places that state similar sentiments throughout the whole bible but lets just skip right before the Second Coming of Jesus to see if keeping the commandment of God is still man's all.
Revelation 12:17 And the dragon was wroth with the woman, and went to make war with the
remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
Here the scripture shows the devil is enraged that God's people still keep His commandments and why would the devil care if it's just a "Jewish thing" the remnant means the small amount left over of the original, which is easy to identify considering the majority of churches no longer teach we need to keep the commandments of God all because they had to deal with the 4th commandment, the Sabbath so most churches would rather toss out the whole Ten than keep God's holy Sabbath commandment. This to me shows how much power is in God's Sabbath and why God's people who are a remnant keep the Sabbath commandment and it is a sign between God and His people according to God Ezekiel 20:20 and how God sanctifies us Ezekiel 20:12 because we can't sanctify ourselves.
Revelation 14:12
Here is the patience of the saints; here
are those who
keep the commandments of God and the faith of Jesus.
The saints are the saved ones and I pray to be part of God's saints. Keeping the law of God won't save you, but being transformed through our relationship with Jesus will and those who have wants to keep the commandments of God because we love God so much and want to do what He asks of us even if that is denying our wants and desires one day a week to keep the ways of the Lord on His holy day. Isaiah 58:13
So the very last chapter and one of the very last verses in the scripture right before the Second Coming of Jesus Christ says this:
Revelation 22:14 Blessed are those who do His commandments, that they may have the right to the tree of life, and may enter through the gates into the city. 15 But
outside are dogs (sinners) and sorcerers (Breaking commandment #1
Exodus 20:3) and sexually immoral (breaking commandment #7
Exodus 20:14) and murderers (breaking commandment #6
Exodus 20:13) and idolaters (breaking commandment #2
Exodus 20:4-6), and whoever loves and practices a lie (breaking # 9
Exodus 20:16).
Whoever practices a lie will not enter into the gates of heaven....
This is what is said for those who claim to know God but do not keep His commandments
1 John2:3
Now by this we know that we know Him, if we keep His commandments. 4
He who says, “I know Him,” and does not keep His commandments, is a liar, and the truth is not in him. 5 But whoever keeps His word, truly the love of God is perfected in him. By this we know that we are in Him. 6 He who says he abides in Him ought himself also to walk just as He walked.
In regards to Matthew 24:20 that is a prophetic chapter and history repeats itself as we saw with God's people in scripture being persecuted, we see it in history where God's people were persecuted by the millions from the Roman Church during the dark ages and once again before Jesus comes God's people will be persecuted for keeping His commandments, but that's okay, because Jesus is coming!