One way to bring forth Zion is to talk about it and live its principles. That's why I have the "how to Zion" blog, here:
The phrase "cause of Zion" appears only four times in the scriptures, all in the D&C.
D&C 6:6, directed to Oliver Cowdery.
D&C 11:6, directed to Hyrum Smith.
D&C 12:6, directed to Joseph Knight Sr.
D&C 21:7, describing Joseph Smith "For thus saith the Lord God: Him have I inspired to move the cause of Zion in mighty power for good, and his diligence I know, and his prayers I have heard."
We can ask, what is the "cause of Zion" in this context?
The phrase "cause of Zion" suggests the cause of the Restoration. D&C 6, 11 and 12 were given before the Book of Mormon was completely translated. D&C 21 was given on April 6, 1830, in connection with the organization of the Church.
Earlier Christian writers had used the phrase. For example, the phrase "cause of Zion" appears three times in a sermon given by Samuel West, the pastor of the church in Dartmouth, the largest town near Joseph's early home in Vermont. The sermon was published in Boston in 1778, and presumably people in the area of Dartmouth would have been familiar with it.
After quoting Isaiah 66:9, West wrote, "i. e. As I have so wonderfully brought forth a people to maintain the cause of Zion against her enemies, can you think that I will stay my hand, and not continue to raise up persons to defend her, till her deliverance is compleated [sic]....
I will now close this Appendix, by asking whether the 66 th chap. of Isaiah, may not be illustrated by compairing it with the 4 th chapter of Micah, the first five verses of which are evidently a prophecy of the glorious state of the Church of Christ in the latter days, in the 6 th verse it is added, in that day i. e. at the time when God shall be about to establish the glorious state of the church..."*
In this sense, Christians everywhere can view Oliver, Hyrum, Joseph Knight, and Joseph Smith as among those persons raised up to defend Zion.
A barn across the road from the Joseph Knight home was the site of the original Colesville branch. Hyrum Smith presided there for five months beginning in October 1830.
79,  p. ; 20 cm. (4 to)
Printed, by Draper and Folsom, at their printing-office, at the corner of Winter-Street.,