Brother, there is no need to speculate about the meaning of the word "rest," because Hebrews chapter 4 tells us what it means. It is not about rest in Jesus as Lord, as you suggested, contradicting the context, but about the "day" of rest known as the Sabbath, highlighted below, a "day" that Joshua misunderstood.
God’s promise of entering his rest still stands, so we ought to tremble with fear that some of you might fail to experience it. For this good news—that God has prepared this rest—has been announced to us just as it was to them. But it did them no good because they didn’t share the faith of those who listened to God. For only we who believe can enter his rest. As for the others, God said, “In my anger I took an oath: ‘They will never enter my place of rest,’” even though this rest has been ready since he made the world. We know it is ready because of the place in the Scriptures where it mentions the seventh day: “On the seventh day God rested from all his work.” But in the other passage God said, “They will never enter my place of rest.” So God’s rest is there for people to enter, but those who first heard this good news failed to enter because they disobeyed God. So God set another time for entering his rest, and that time is today. God announced this through David much later in the words already quoted: “Today when you hear his voice, don’t harden your hearts.” Now if Joshua had succeeded in giving them this rest, God would not have spoken about another day of rest still to come. So there is a special rest still waiting for the people of God. For all who have entered into God’s rest have rested from their labors, just as God did after creating the world. So let us do our best to enter that rest. But if we disobey God, as the people of Israel did, we will fall. (Hebrews 4:1-11 NLT)
Again, there is no need to speculate in Hebrews chapter 4, because the meaning of the word “rest” is given to us: it is the Sabbath "day", the seventh day of creation, a “day” that Joshua misinterpreted in the following statement. In other words, there is something wrong with the Jewish understanding of the “day” of the Sabbath since Joshua.
Now if Joshua had succeeded in giving them this rest, God would not have spoken about another day of rest still to come. (Hebrews 4:8 NLT)
United in our hope for the soon return of Jesus, Jorge
		
 
Brother, I am going to have to continue explaining Heb. 4. Your commentary only covers what suits your belief and in your own words rather that how the verses are actually written. So in my previous post I established the audience and context which clearly shows that the writer of Hebrews is referring to those with faith.
“For He has said somewhere concerning the seventh day: “And God rested on the seventh day from all His works”; and again in this passage, “They certainly shall not enter My rest.””
Hebrews 4:4-5 NASB2020
This quote from Genesis 2:2 highlights that God's rest signifies the completion of His creative work. The Sabbath day rest was established as a type or shadow of this greater spiritual rest.
However, verse 5 connects the Old Testament example of the Israelites who did not enter the Promised Land with the future promise of God's rest. The condition for entering this rest is not a physical journey, but "faith in His promises, through His Son".
The inability to enter is due to a lack of faith, not a lack of the promise itself.
“Therefore, since it remains for some to enter it, and those who previously had good news preached to them failed to enter because of disobedience,”
Hebrews 4:6 NASB2020
Two subsets of people are listed here, those who have not entered yet which are non believers and those who had the good news preached to them but rejected it, Jews.
“He again sets a certain day, “Today,” saying through David after so long a time just as has been said before, “Today if you hear His voice, Do not harden your hearts.””
Hebrews 4:7 NASB2020
So here, instead of the previous seventh Day, God sets a new day and that is “today”. σήμερον translates as “this day”. This is a quote from Ps. 95:7-8 where David was pleading for Israel to have faith and not harden their hearts. So it is no longer about A day, one day a week, but about any day of the week. We should have faith every day and worship Him every day.
“For if Joshua had given them rest, He would not have spoken of another day after that.”
Hebrews 4:8 NASB2020
If Joshua’s rest would have been enough refers to going into the promised land. Joshua’s rest was not enough so then God himself would not have spoken by David of a better and heavenly rest promised to believers in the gospel. Remember that Joshua already had the Ten Commandments so the rest, even of the sabbath, was not enough.
“Consequently, there remains a Sabbath rest for the people of God. For the one who has entered His rest has himself also rested from his works, as God did from His.”
Hebrews 4:9-10 NASB2020
Since this is the rest that the Jews could not enter by faith, and since in the previous verse  another day was chosen, and since verse 7 also confirms that another day was chosen, today, then this refers to the OT sabbath as a shadow of what is now Jesus’s rest. Also those that enter Jesus rest, by faith, has also rested of their works since works are the result of faith not the condition for faith. Jesus is the Lord of the sabbath and as such is our rest.
So I still need you to post a post crucifixion verse that requires the Christian to keep the 4th commandment.