Q.Silver Dollar Eucalyptus Tree
I planted a Eucalyptus tree 2 years ago. It was about 2 ft high. Planted it in full sun. The tree is still alive and has survived ice and cold temperatures. It has grown only maybe one foot. Why would it not be growing at a faster rate? What can I do to improve growth rate?

Fertilizer is generally not needed for members of this genus. In some cases the Eucalyptus can become iron dificient in iron.
It can be helpful to apply chelated iron in the fall and early spring, for young developing trees.
https://www.gardeningknowhow.com/ornamental/trees/eucalyptus/tips-growing-eucalyptus.htm
https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm