In Hebrews 1:8, it is very clear, that God the Father addresses Jesus Christ, and says directly to Him, "Your Throne O God is for ever"
Even the Unitarian New Testament by George Noyes, reads here, : “but of the Son: ‘Thy throne, O God, is for ever and ever”.
Another Unitarian, the Greek scholar, Dr Winer, says of the Greek in this verse:
“The nominative (with the article) is sometimes used in an address, particularly in calling or commanding, thus taking the place of the vocative…H. i.8” (A Treatise on the Grammar of New Testament Greek, p.227)
This means, that it can only read, "Your Throne O God", and not as corrupted by some, "God is your Throne"
Even though both these scholars are Unitarians, who reject that Jesus Christ is Almighty God, they yet on this verse, are honest to say what it really means, and not force their theology!
These words in Hebrews 1, are taken from Psalm 45:6-7, which is a Prophecy of the Coming Messiah. In the Jewish Aramaic Targum on the Psalm, the words are used as a direct address to Jehovah, “The throne of Thy majesty, O Jehovah, abideth for ever and ever.” (Cambridge Bible for Schools and Colleges).
The Hebrew scholar, Aquila, who published a Greek Version of the Old Testament, in the middle of the 2nd century A.D., translates the Hebrew, by the Greek, “ο θρονος σου θεε”, which is undoubtedly the vocative, “Your throne, O God”. (Fredrick Field, Origen Hexapla, vol. II, pp. 162-163). It is clear, that as early as the 2nd century, the Hebrew was understood as the vocative, and not the nominative.
You are completely wrong in your supposing, that the elders in Revelation 5:13-14, only Worshipped the Father. This is your personal view and nothing to do with the context. In verse 13, "And ALL of the Creation, which is in the heaven, and on the earth, and under the earth, and on the sea, and all things that are in them, heard I saying, to Him Who sits on the throne, and unto the Lamb, be ALL the blessing, and ALL the honour, and ALL the glory, and ALL the might, for ever and ever" (so emphasized in the Greek). ALL that is here ascribed to God the Father, is EQUALLY ascribed to Jesus Christ. Note the words, “τω καθημενω επι του θρονου και τω αρνιω”, “to Him Who sits on the throne AND to the Lamb”, where the Greek conjunction, “και”, is used for “sameness”, with absolute equality. IF, as you say, that Jesus Christ is not God, then there is no way that He could ever have been included WITH the Father, to receive ALL of what the Father does! The Bible is against what you believe.
Also, in Revelation 1:17, and 2:8, we read of Jesus Christ say of Himself, that He is, "the first and the last". Another Unitarian, Dr Joseph Thayer says of the words, " ὁ πρῶτος καί ὁ ἔσχατος, i.e. the eternal One" (Greek Lewxicon, page, 554). Which can ONLY mean that Jesus Christ is UNCREATED, and ETERNAL. Add to this the words of Jesus Christ in chapter 22, “I am THE Alpha and THE Omega, THE First and THE Last, THE Beginning and THE End”. In Isaiah 44:6, we read, “Thus says the LORD, the King of Israel and his Redeemer, the LORD of hosts: “I am THE First and I am THE Last; besides me there is no god”. It is not only impossible for Jesus to have said these words about Himself, IF, as some teach, that He is no more than a mere “created” being, but, it would also be the highest form of blasphemy. However, we are confident from what we read in the Infallible Word of God, that there can be no doubt, that Jesus Christ, IS indeed ALMIGHTY GOD, without beginning or end, as are God the Father, and God the Holy Spirit.