Isaiah 47:4 - Only God is redeemer

 Isaiah 47:4 (KJV)  As for our redeemer, the LORD of hosts is his name, the Holy One of Israel.

Yes indeed Yahweh God almighty is our ultimate redeemer and he sent forth his son as his redemption agent as the below verses testifies. Similar to God being the only saviour, there is no redemption apart from God, but he can, and does use men as instruments to save and redeem.

Galatians 4:4-5 (KJV)  But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
To redeem them that were under the law, that we might receive the adoption of sons.

Romans 3:24-25 (KJV)  Being justified freely by his grace through the redemption that is in Christ Jesus:
Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;

Isaiah 43:11 - beside me there is no saviour

Isaiah 43:11 (KJV)  I, even I, am the LORD; and beside me there is no saviour.

What God is communicating here is that he is the one ultimately who saves.

Why? Because he is the one who raises up saviours. The OT is replete with examples of God raising up saviours.

Then the Lord raised up judges who saved them from the hands of those who plundered them....When the Lord raised up judges for them, the Lord was with the judge and saved them from the hand of their enemies all the days of the judge. Judges 2:16,18

When the sons of Israel cried to the LORD, the LORD raised up a Savior for the sons of Israel to save them, Othniel the son of Kenaz, Caleb's younger brother. Judges 3:9

But when the sons of Israel cried to the LORD, the LORD raised up a Savior for them, Ehud the son of Gera, the Benjaminite. Judges 3:15

After him came Shamgar the son of Anath, who struck down six hundred Philistines with an oxgoad; and he also saved Israel. Judges 3:31

The Lord looked at him and said, “Go in this your strength and save Israel from the hand of Midian. Have I not sent you?" Judges 6:14

Then Gideon said to God, “If You will save Israel through me, as You have spoken, behold, I will put a fleece of wool on the threshing floor. f there is dew on the fleece only, and it is dry on all the ground, then I will know that You will save Israel through me, as You have spoken.” Judges 6:36-37

The Israelites said to Gideon, “Rule over us—you, your son and your grandson—because you have saved us from the hand of Midian." Judges 8:22

For behold, you shall conceive and give birth to a son, and no razor shall come upon his head, for the boy shall be a Nazirite to God from the womb; and he shall begin to save Israel from the hands of the Philistines.” Judges 13:5

Then Jehoahaz besought the Lord, and the Lord hearkened to him; for he saw the oppression of Israel, how the king of Syria oppressed them. Therefore the Lord gave Israel a Savior, so that they escaped from the hand of the Syrians. 2 Kings 13:4-5

Therefore You delivered them into the hand of their oppressors who oppressed them, But when they cried to You in the time of their distress, You heard from heaven, and according to Your great compassion You gave them Saviors who saved them from the hand of their oppressors. Nehemiah 9:27

The Saviors will ascend Mount Zion to judge the mountain of Esau, and the kingdom will be the LORD'S. Obadiah 1:21

In the NT Jesus is clearly another saviour that God has raised. Jesus (Yahoshua) literally means YAHWEH"S SALVATION.

He is the one whom God exalted to His right hand as a Prince and Savior, to grant repentance to Israel, and forgiveness of sins.Acts 5:31

From the seed of David, according to promise, God has raised up to Israel a Savior, Jesus. Acts 13:23

The Father has sent the Son as Savior of the world. 1 John 4:14

Blessed be the Lord God of Israel for He has visited us and accomplished redemption for His people and He has raised up a horn of salvation for us in the house of David His servant. Luke 1:68-69.

He is the one whom God exalted to His right hand as a Prince and a Savior, to grant repentance to Israel, and forgiveness of sins. Acts 5:31.

Without God... besides him,  there is no saviour.

Isaiah 9:6 - The mighty God

 Isaiah 9:6 (KJV)  For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.

I handle Isaiah 9:6 by saying....just because people bear a certain name, it doesn't make them that name.

I named my son Maximilian which means the greatest. I think God is the greatest not my son. But I want my son to aspire to be great. To be godly if you like. Lots of South American people call their son Jesus. Doesn't mean their son is Jesus.

The name Elijah means "My God Yahweh"... so you have this kid Elijah walking around his local villages saying "Hi.... I'm my God Yahweh". Of course, no one took this literally.

Even Christians in the book of revelation bear God's name. Doesn't mean they are the person God right?

I'm not even gonna get into the fact that El Gibbor which is usually translated mighty God in English translations is translated differently by the same translations in Ezekiel 32:21 in its plural form as just the mighty,  or mighty leaders, or mighty chiefs etc.

And don't forget. Moses is called God. The judges are called gods. Doesn't mean they are the one true God. Just means they represent God.

Plus there is the problem that if you want to take mighty God literally then for consistency you need to take everlasting father in the same way.... which is a horrid contradiction for trinitarianism because the Father and the son are supposed to be separate persons.