While it is true that Satan will be bound during the first thousand years after Christ returns to earth, look at the bolded words in the verse below to see what is also true of that time.
Re 20:4 - And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and
they lived and reigned with Christ a thousand years.
Re 5:10 - And hast made us unto our God kings and priests: and
we shall reign on the earth.