The main reward in the Kingdom is simply to be there.
The concept of being rewarded with crowns is only found as part of allegory in the Bible. For example, Paul said
I have fought the good fight, I have finished the race, I have kept the faith. Henceforth there is laid up for me the crown of righteousness, which the Lord, the righteous judge, will award to me on that Day, and not only to me but also to all who have loved his appearing. (2 Timothy 4:7-8)
Other examples are:
Blessed is the man who remains steadfast under trial, for when he has stood the test he will receive the crown of life, which God has promised to those who love him. (James 1:12)
And when the chief Shepherd appears, you will receive the unfading crown of glory. (1 Peter 5:4)
None of these verses appears to refer to literal crowns; rather, they are using the crown as a symbol of the reward that will be granted to the faithful in God’s Kingdom.
That we will have different roles in the kingdom is perhaps suggested in Jesus’ parable of the talents in Luke 19:11-27 where the servants are rewarded with authority over different numbers of cities but this was probably not intended to be taken literally.
We do know that some people will have important roles in God’s kingdom. For example, Jesus said to the apostles
Truly, I say to you, in the new world, when the Son of Man will sit on his glorious throne, you who have followed me will also sit on twelve thrones, judging the twelve tribes of Israel. (Matthew 19:28)
But there is no suggestion in the Bible of a hierarchy of reward based on works. On the contrary,
For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast. (Ephesians 2:8-9)