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I found a publication that says they don't start blooming till they are 5 to 7 years old. So you are almost there! The flowers are formed in the fall, so do any major pruning in the spring after flowering.

https://www.uaex.edu/yard-garden/in-the-garden/reference-desk/trees/empress-tree.aspx

https://www.gardeningknowhow.com/ornamental/trees/royal-empress/pruning-empress-trees.htm

If others in the area are looking as your are, I would say that it was an environmental factor. Unfortunately, that would take more than a lifetime to change. Typically, they sustain much of their damage when the temperatures are a little cooler than usual, as they are not tolerant to the cold.

The only thing that you can do is to help provide it with the proper care, until the conditions are more favorable.

Here is an article that will help you with their care:

https://www.gardeningknowhow.com/ornamental/trees/flame-tree/flamboyant-flame-tree-info.htm

There are several cultivars that are hard to tell apart. They vary in height from 15 feet to about 60 feet. From the sound of it, the tree may only reach 15 feet in height. It may be one of the shorter cultivars.

Feeding with an all purpose 10-10-10 every 3 or 4 months or so can keep it looking its best.

Here is an article that will give you more information on the tree:

https://www.gardeningknowhow.com/ornamental/trees/royal-empress/worlds-fastest-growing-shade-tree.htm

The only thing that you can do is give it a little time. It doesn't look bad at all, so recovery will be a simple process for the tree. They are quite hardy.

Here is an article that will help you to care for the tree:

https://www.gardeningknowhow.com/ornamental/trees/royal-empress/worlds-fastest-growing-shade-tree.htm

Has it bloomed before or is this its first time? Environmental happenings can cause a tree to bloom out of sync, such as a late freeze, early fall, or if the tree is stressed from drought, for example, causing it to go dormant. When conditions normalize in fall, it may come out of dormancy and bloom. When this happens, it doesn't usually expend all its blooms and should bloom again in spring.

Your tree should be planted in fall or spring, so if you're still experiencing mild fall weather, you may want to do it now. It is plenty big enough for transplanting. You'll need to consider that the root system of these trees can become highly destructive, so make sure you plant it in an area where it can spread and grow without interfering with wires or structures.

Here's an article:
https://www.gardeningknowhow.com/ornamental/trees/royal-empress/worlds-fastest-growing-shade-tree.htm