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The Gospel is proclaimed by an ordained deacon or priest.

But why can’t a regular person proclaim the Gospel??

“The Gospel is proclaimed by an ordained deacon or priest.”

The Gospel is proclaimed by everything in the universe.

L

While you claim to follow apostolic teaching, besides there being no separate class of sacerdotal clergy in the NT church called by the distinctive name for such ( “hiereus” and “archiereus," later becoming "priest" and "high priest" in English), even in Catholicism the reading of the gospel was not always restricted to the priest.

The old Catholic Encyclopedia informs,

The Gospel has been for many centuries in East and West the privilege of the deacon. This was not always the case. At first a reader (anagnostes, lector) read all the lessons. We have seen a case of this in the story of St. Cyprian and Aurelian (see above). St. Jerome (died 420) speaks of the deacon as reader of the Gospel (Ep. cxlvii, n. 6), but the practice was not yet uniform in all churches. - http://www.newadvent.org/cathen/06659a.htm

Today regarding proclaiming the Gospel reading at a liturgical celebration, according to the USCCB,

In the absence of a priest or deacon, several of the liturgical books make provisions for a lay minister to proclaim the Gospel, most notably Sunday Celebrations in the Absence of a Priest and the Book of Blessings. - http://www.usccb.org/prayer-and-worship/the-mass/order-of-mass/liturgy-of-the-word/proclamation-of-the-gospel-by-the-laity.cfm

Of course, without a Catholic priest RCs can have no Eucharist, even though you will never see them described conducting the Lord's supper in the inspired record (Acts - Revelation) of what the church did and how they understood the gospels, or charged with this as being a unique and or primary function, nor preaching the Lord's supper as the means of regeneration, that of obtaining spiritual life. .

Which is in contrast to presbuteros/episkopeos (same persons) being charged with preaching the word as their primary active function, (2Tim. 4:2) ) feeding the flock thereby. (Acts 20:28) believing the gospel being the means of regeneration, of obtaining spiritual life (Acts 10:43; 15:7-9; Eph. 1:13) and being nourished (1Tim. 4:6) and built up (Acts 20:32) for the word, is what is called spiritual food, "milk" (1Co. 3:22; 1Pt. 1:22) and "meat," (Heb. 5:12-14

Which is just one of the many Catholic distinctives not seen in the inspired record of what the church did and how they understood the gospels,

The Gospel is proclaimed by an ordained deacon or priest.

The first martyr of the church was Stephen who was a lay person and was martyred for proclaiming the gospel.