In the context of Isaiah 14, being like the Most High does not mean being like God in character or attitude. Isaiah 14:1215 is talking about an attempted coup, a desire to surpass God.
The ambition to be like the Most High is a recurring theme in Scripture, highlighting the sin of pride and the futility of attempting to rival God's unique position.
I will ascend above the heights of the clouds; I will be like the most High.

Isaiah 14:14 KJV: I will ascend above the heights of the clouds; I will be like the most High.
That they may know that You alone, whose name is the Lord, Are the Most High over all the earth.

Such details provide a deeper understanding and appreciation for Said To Be The Most High.
14 I will ascend above the heights of the clouds; I will be like the most High.
Genesis 14:19 and he blessed Abram and said: Blessed be Abram by God Most High, Creator of heaven and earth, Psalm 92:8 But You, O LORD, are exalted forever!