I know about this passage, I think it VITAL to read a few verses before that too, to understand what is really going on there:
Jeremiah 33:14-18,14 See, the days are coming,’ declares יהוה, ‘when I shall establish the good word which I have promised to the house of Yisra’ĕl and to the house of Yehuḏah:"15 In those days and at that time I cause a Branch of righteousness to spring forth for Dawiḏ. And He shall do right-ruling and righteousness in the earth."16 In those days Yehuḏah shall be saved, and Yerushalayim dwell in safety. And this is that which shall be proclaimed to her: ‘יהוה our Righteousness.’"17 “For thus said יהוה, ‘For Dawiḏ there is not to cease a man to sit on the throne of the house of Yisra’ĕl."18 And for the priests, the Lĕwites, there is not to cease a man to offer ascending offerings before Me, to kindle grain offerings, and to sacrifice continually.’ ”
I think Psalm 89 is vital here as are many other passages. AS Ps132,
Isaiah 9:7 Of the increase of His rule and peace there is no end, upon the throne of Dawiḏ and over His reign,a to establish it and sustain it with right-ruling and with righteousness from now on, even forever. The ardour of יהוה of hosts does this. Footnote: aSee Isa 16:5, Psa 2:1-12, Psa 45:6, Mic 5:2, Luk 1:32-33."
Hebrews 1:8-9,8 But to the Son He says, “Your throne, O Elohim, is forever and ever, a sceptre of straightness is the sceptre of Your reign."9 “You have loved righteousness and hated lawlessness. Because of this, Elohim, Your Elohim, has anointed You with the oil of gladness more than Your companions.” Psa 45:6-7."
I did notice "until all things are fulfilled" and ALL is not YET fulfilled:
There are 2 "it is done" statements...
Fulfilled already
John 19:30, “So when יהושע took the sour wine He said, “It is done!” And bowing His head, He gave up His spirit.”
To be fulfilled in the future
Revelation 21:4-8, “And Yah shall wipe away every tear from their eyes, and there shall be no more death, nor mourning, nor crying. And there shall be no more pain, for the former matters have passed away. And He who was sitting on the throne said, “See, I make all matters new.” And He said to me, “Write, for these words are true and trustworthy. And He said to me, “It is done! I am the ‘Aleph’ and the ‘Taw’, the Beginning and the End. To the one who thirsts I shall give of the fountain of the water of life without payment. The one who overcomes shall inherit all this, and I shall be his Strength and he shall be My son. But as for the cowardly, and untrustworthy, and abominable, and murderers, and those who whore, and drug sorcerers, and idolaters, and all the false, their part is in the lake which burns with fire and sulphur, which is the second death.”
There are hundreds of "Old Testament" prophecies that are still future.
Mat 7:12-14, "Therefore, all things you want men to do to you, do the same to them, for this is the (intent of the) Law and the Prophets. Enter in through the narrow gate; for wide is the gate and broad is the way that leads to destruction, and many are those who go that way. Because straight is the gate, and narrow is the way which leads to life, and few there are who find it."
As for the trinity the main "trinity" verse is a well known forgery:
1 John/Yahanan 5:7-8, "For there are three which testify: The Spirit, the water, and the blood; and these three are of one accord."
Altered text from the 9th - 15th century:
1 John/Yahanan 5:7-8, "For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one."
1 John 5:7-8, “Because there are three who bear witness: the Spirit, and the water, and the blood. And the three are in agreement."
‘Comma Johanneum’ or ‘the Heavenly Witnesses’ refers to a short clause in John 5:7-8 in the Latin Vulgate text which was transmitted since the Early Middle Ages. It was later included in the Textus Receptus (published in 1516) in support of trinity doctrine. The ‘comma’ does not appear in the older Greek text. The comma first appeared in the Vulgate manuscripts of the 9th century. The first Greek (Textus Receptus) manuscript that contains the comma dates from the 15th century. The comma is absent from the Ethiopiac, Aramaic, Syriac, Slavic, Armenian, Georgian, and Arabic translations of the Greek New Testament. The scholarly consensus is that that passage is a Latin corruption that entered the Greek manuscript tradition in some subsequent copies. As the ‘comma’ does not appear in the manuscript tradition of other languages.
I personally take joy in knowing YHWH is the Father and Yahshua is the Messiah, beyond that I dont get into to much of a debate or make a big deal. Nowhere does it say the trinity is a salvation issue in Scripture, so I like to spend my mind and heart seeking Yah.