4:10 the twenty-four elders will fall down before Him who sits on the throne, and will worship Him who lives forever and ever, and will cast their crowns before the throne, saying,
the twenty-four elders
When the four living creatures give GLORY, HONOR, and THANKS in verse 9, the ripple effect upon the 24 elders is to cause them to the three actions above.
Let's look at what "will" means:
This GREAT WORK is a recognition of Christ's work IN US of regeneration; 1 John 3:2 -- we shall be like Him, He is not like us (physically sinful) today.
This GREAT WORK is a recognition of Christ's work THROUGH US of service; Romans 1:18-19 -- God is made evident in us. "Let the beauty of Jesus be seen in me!"
This GREAT WORK is a recognition of Christ's work FOR US of keeping, cleansing, protecting, and perfecting; Philippians 3:20-21 -- transforming our body.
The CROWN I receive is because Jesus Christ bears much fruit through me. So I really didn't get and don't deserve my crown anyway (John 15:4-5-8).