In Frozen 1,2 Elsa only has powers of ice but imagine if Elsa not only has the powers of ice but powers of all other elements like water, wind, and air.
These new powers are not just powers they will welcome some new challenges If Elsa has Powers of Water Not intentionally but she can accidentally cause some destruction using water in the kingdom of Arandelle.
Similarly, if she has powers of Wind, she may cause some powerful wind storms to hit the kingdom of Arandelle.
With the power of the air, she can make air more windy and powerful which can ultimately cause the destruction in the kingdom of Arrandelle.
To control the powers she and Anna can set out to different regions and face different peoples and individuals with can help them or challenge them.
This story would allow Elsa to explore her powers in depth, ultimately learning that balance and harmony are the true essence of her magic.