Isaiah 61:10
Have you ever been overwhelmed with joy at something? I know I have. Many things. But Isaiah here is overwhelmed with joy in the LORD because of His salvation. Now that’s something to be joyous about!
It is not God’s desire for anyone to be separated from Him. His entire plan for our world was messed up by the devil’s lies and Adam & Eve’s free will. He put a plan in place to redeem anyone who so chooses to be redeemed. Jesus's death, burial, and resurrection provided salvation and righteousness to everyone who accepts it.
Having a relationship with God and a home in Heaven is definitely worth being joyous about!