His purpose, from the beginning:
"And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth." Only sin, leading to death, could keep A & E from that, which is what happened. Did Jehovah have to change his purpose? That would make Satan more powerful.
"For as the rain cometh down, and the snow from heaven, and returneth not thither, but watereth the earth, and maketh it bring forth and bud, that it may give seed to the sower, and bread to the eater: So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it." So it seems not. In the meantime he had David write Ps 37, which Jesus was happy to quote at Mt 5:5. Not to mention this plain statement elsewhere: "For thus saith the LORD that created the heavens; God himself that formed the earth and made it; he hath established it, he created it not in vain, he formed it to be inhabited: I am the LORD; and there is none else." AND it's all finished with his signature, at least in a properly translated Bible: "I am Jehovah, that is my name; and my glory will I not give to another, neither my praise unto graven images." ASV, 1901
'Good people go to heaven' - Yes, they do, for a particular task. Rev 5:9.10, which ties directly to Ps 37, to those with eyes to see.
'God will destroy the earth' - Why? is he angry with it, or with the ungodly men who were temporary residents of it?
"For this they willingly are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water:
Whereby the world that then was, being overflowed with water, perished: [Yet we still stand on that earth.]
But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men."
Like many others, your errors come from your the misunderstandings imparted by your sound-bite teachers. You can change that, so your ignorance will no longer be willful. That counts, with Jehovah.