I also don't see any OT writers quote any writings of Enoch. If these writings were really of God I would expect that.
Well, here is Isaiah:
Enoch 9:9-12 Thus has the whole earth been filled with blood and with iniquity. 10And now behold the souls of those who are dead, cry out. 11And complain even to the gate of heaven. 12Their groaning ascends; nor can they escape from the unrighteousness which is committed on earth. You know all things, before they exist.
Isaiah 26:21 For, behold, the LORD cometh out of his place to punish the inhabitants of the earth for their iniquity: the earth also shall disclose her blood, and shall no more cover her slain.
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Enoch 39:11 What is this world? Of every existing generation those shall bless you who do not spiritually sleep but stand before your glory, blessing, glorifying, exalting you, and saying,
The holy, holy, Lord of spirits, fills the whole world of spirits.
Isaiah 6:2-4 Above it stood the seraphims: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly. And one cried unto another, and said,
Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory.
Here is Isaiah, Ezekiel, Joel, Matthew 24, Revelation verifying Enoch:
Enoch 79:2 And all things have I revealed to you. You see the sun, the moon, and those which conduct the stars of heaven, which cause all their operations, seasons, and arrivals to return. 3In the days of sinners the years shall be shortened. 4Their seed shall be backward in their prolific soil; and everything done on earth shall be subverted, and disappear in its season. The rain shall be restrained, and heaven shall stand still. 5In those days the fruits of the earth shall be late, and not flourish in their season; and in their season the fruits of the trees shall be withholden. 6The moon shall change its laws, and not be seen at its proper period. But in those days shall heaven be seen; and barrenness shall take place in the borders of the great chariots in the west. Heaven shall shine more than when illuminated by the orders of light; while many chiefs among the stars of authority shall err, perverting their ways and works. 7Those shall not appear in their season, who commanded them, and all the classes of the stars shall be shut up against sinners. 8The thoughts of those who dwell on the earth shall transgress within them; and they shall be perverted in all their ways. 9They shall transgress, and think themselves (85) gods; while evil shall be multiplied among them. 10And punishment shall come upon them, so that all of them shall be destroyed.
Isaiah 13:9-11 Behold, the day of the LORD cometh, cruel both with wrath and fierce anger, to lay the land desolate: and he shall destroy the sinners thereof out of it. For the stars of heaven and the constellations thereof shall not give their light: the sun shall be darkened in his going forth, and the moon shall not cause her light to shine. And I will punish the world for their evil, and the wicked for their iniquity; and I will cause the arrogancy of the proud to cease, and will lay low the haughtiness of the terrible.
Ezekiel 32:6-8 I will also water with thy blood the land wherein thou swimmest, even to the mountains; and the rivers shall be full of thee. And when I shall put thee out, I will cover the heaven, and make the stars thereof dark; I will cover the sun with a cloud, and the moon shall not give her light. All the bright lights of heaven will I make dark over thee, and set darkness upon thy land, saith the Lord GOD.
Joel 2:9-11 They shall run to and fro in the city; they shall run upon the wall, they shall climb up upon the houses; they shall enter in at the windows like a thief. The earth shall quake before them; the heavens shall tremble: the sun and the moon shall be dark, and the stars shall withdraw their shining: And the LORD shall utter his voice before his army: for his camp is very great: for he is strong that executeth his word: for the day of the LORD is great and very terrible; and who can abide it?
Matthew 24:28-30 For wheresoever the carcase is, there will the eagles be gathered together.
Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
Revelation 8:6-13 And the seven angels which had the seven trumpets prepared themselves to sound. 7 The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up. 8 And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea: and the third part of the sea became blood; 9 And the third part of the creatures which were in the sea, and had life, died; and the third part of the ships were destroyed.10 And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters;11 And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter. 12 And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise. 13 And I beheld, and heard an angel flying through the midst of heaven, saying with a loud voice, Woe, woe, woe, to the inhabiters of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!