Benjamin Corey writes about God’s changing unchanging love:

God is unchanging love. But the way he loves changes all the time depending on the circumstance. In fact, love invites us to be constantly changing and adapting to achieve the most beauty that’s possible– even if that means we love in ways that contradict how we loved in the past. Ironically, the unchanging nature of God is the very thing that causes God to be constantly changing— because love always grows, changes, and surprises us in beautiful ways.

Yes, God changes. His unchanging essence of love demands it. That’s the paradox of love.

In Scripture I see a God who is always changing– not in essence, but in how to love a world that’s constantly changing. The reason God changes is due to a combination of his unchanging essence of perfect love, and the divine constraint that requires God to always seek the options that lead to the most beauty. As situations change, the options as to how to love best also change.
It’s how we went from Gentiles being out to Gentiles being in. It’s how the outcasts became the guests at God’s banquet. It’s how the late vineyard workers got paid a full day’s wage. It’s how the unclean became clean.