“for he [Moses] was afraid to look at God.” (Ex 3:6)
This same Moses would beg God for the privilege to see Jehovah’s face and glory in Exodus 33 with such zeal that God would have to explain “You cannot see my face, for no man can see Me and live!”
What changed? Not God – God is the same yesterday, today, and forever (Heb 13:8).
Moses changed. His fear of God blossomed into adoration. His fear was the beginning of wisdom (Pr 9:10), but the Lord’s discipline, guidance, and mercy transformed Moses into a man that loved the Lord more than he feared Him. He stopped running from God and started running to Him.