In reply to your 1/02/2022 post a vision of the two natures of Christ? (fivedoves.com) I believe that the Ancient of Days mentioned in Daniel 7:9-10, & 13 is God, the Father, and that the Son of man is the Lord Jesus in Daniel 7:13-14 and not two natures of Christ.  The Ancient of Days is also in Daniel 7:21-22, "I beheld, and the same horn made war with the saints, and prevailed against them; Until the Ancient of days came, and judgment was given to the saints of the most High; and the time came that the saints possessed the kingdom."

And no, this wouldn't be Yahweh's (God, the Father) first advent of coming to Earth.  He came down on Mt. Sinai & gave the Ten commandments to Moses.  If you click on the link below, it shows the name Yahweh instead of Jehovah in the Hebrew interlinear Bible in Exodus 19:20. 

Exodus 19:20 Interlinear: And Jehovah cometh down on mount Sinai, unto the top of the mount, and Jehovah calleth for Moses unto the top of the mount, and Moses goeth up. (biblehub.com)