First of all, that word "reign" as "they lived and reigned with Christ 1000 years" is not speaking of reigning or ruling over people here but rather it referring to the true believers reiging over the world the flesh and the Devil and meaning that they will not be moved or ruled by the world the flesh and the Devil but will be victorious over them instead.
Paul uses this word like this also in Romans 5:17 below.
Romans 5:17 For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God’s abundant provision of grace and of the gift of righteousness reign in life through the one man, Jesus Christ!
So we see then, that the word "reign" isn't always referring to ruling over people and it isn't in Revelation 20 either.
So let me give you an example of what I see in Revelation 20.
First off, the Devil isn't literally bound and especially not with a chain and which should be a big hint that John is not speaking literally here but rather symbolically.
So how was Satan bound then and for what purpose.
He was bound by what Jesus did on the cross and by the preaching of the gospel message about it and which means that as long as he remains bound, he cannot keep the nations from the truth of the gospel message, for that is what John says it is for also but he is not bound from keeping those in the dark who don't want to believe the gospel.
Now about the symbolic 1000 years, it is symbolically referring to this present age in which both the wicked and believers live and die and in which some believers will die as martyrs also.
2 Peter 3:8 for with God one day in this present age of his mercy and grace is as a thosuand years and a thousand years as one day.
It is not speaking of a human lifespan being extended to 1000 years either and which many falsely believe but it is only figurative for this present age.
Now about the thrones and they that sat on them, this is also symbolic for God's people who are victorious over the world the flesh and the Devil and actually Paul himself uses the same symbolism in Ephessians 2 and as seen below.
Ephesians 2: 2 As for you, you were dead in your transgressions and sins, 2 in which you used to live when you followed the ways of this world and of the ruler of the kingdom of the air, the spirit who is now at work in those who are disobedient. 3 All of us also lived among them at one time, gratifying the cravings of our flesh[a] and following its desires and thoughts. Like the rest, we were by nature deserving of wrath. 4 But because of his great love for us, God, who is rich in mercy, 5 made us alive with Christ even when we were dead in transgressions—it is by grace you have been saved. 6 And God raised us up with Christ and SEATED US WITH HIM in the heavenly realms in Christ Jesus,
You should also notice the association of the believers with Jesus and his resurrection here, for that is also being spoken of symbolically in Revelation 20, notice the words "made us alive and raised us up together with Christ".
For the believers resurrection doesn't start with his body but with his spirit man or inner man and that is what John is referring to also in Revelation 20 by those who take part in the first resurrection, for it is the resurrection of Christ in which the believer takes part and is made aive unto God.
Now then concerning the words in Rev 20: "judgment was given unto them" this is refering to the fact that through Christ Jesus, they have passed from death to life and therefore were judged and accepted by God through the person of Christ and not by their own merits or lack of them because of sin.
Now concerning the Martyrs mentioned in Rev 20, again, within this present age as symbolised by the 1000 years, we live and die and many will also die as Martyrs by the beast and John is seeing all of this.
When he says that these all came to life and reigned with Christ for the 1000 years, he is stepping back to the beginning of everything he already stated and giving a more detailed description of what he is being revealed here.
We come to life first through Christ and by taking part of his own resurrection which John is calling the first resurrection because it is, then we live and die in this age and of which we reign victoriously over the world the flesh and the Devil and then some or even many of us who are true believers will die as martyrs and some or many at the hands of the beast also.
Now in closing on this, John doesn't focus here on the bodily resurrection of the believers but only on that of the wicked and that is becasue for the believers, there resurrection begins not with their body but with their spirit man with Christ whose resurrection was the first and by which also thier resurrection into a glorious new body is also a sure thing .
However, with the wicked, the only resurrection that they will ever have is of the old body being brought back to life and then also destroyed in the lake of fire and this is why John didn't need to mention the bodily resurrection of the saints, because it a sure thing and will happen at the same time as that of the wicked.
This is what I see in Revelation 20 and when Jesus returns in the clouds and appears unto every eye, it will be all over and the end period just like Paul says in 1 Corinthians 15;22-26 also and as seen below.
1 Corinthians 15:22 For as in Adam all die, so in Christ all will be made alive. 23 But each in turn: Christ, the firstfruits; then, when he comes, those who belong to him. 24 Then the end will come, when he hands over the kingdom to God the Father after he has destroyed all dominion, authority and power. 25 For he must reign
until he has put all his enemies under his feet. 26 The last enemy to be destroyed is death.
