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These articles will help you:
https://www.gardeningknowhow.com/ornamental/vines/trumpet-vine/trumpet-vine-no-blooms.htm
https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm

This article should help you with lack of blooms on your trumpet vine
https://www.gardeningknowhow.com/ornamental/vines/trumpet-vine/trumpet-vine-no-blooms.htm

Trumpet Vine are very slow to mature and it can take up to 10 years for flowers.

Here is an article that will help you.

https://www.gardeningknowhow.com/ornamental/vines/trumpet-vine/trumpet-vine-no-blooms.htm

First, provide a new transplant with shade by putting some garden stakes or sticks in the ground and covering with a leaf bag. Do you have heavy clay soil or sandy soil. Is it windy? These factors as well as temp and hot sun determine how much to water. Don't water unless the top 1-2" of soil is bone dry. Roots that are kept too wet will rot. Also, don't fertilize. The plant needs to establish its roots before working on top growth. This plant is capable of massive growth; I hope you put it in a large space!

If you grew the vine from seed, it may not be growing true to seed. The original vine was likely a hybrid, a cross between different colored cultivators.

https://www.gardeningknowhow.com/ornamental/vines/trumpet-vine/growing-trumpet-vines.htm

Trumpet vine needs regular watering in hot or dry weather. It also needs well-drained soil. It readily grows in forests which tells me it likes some afternoon shade. If the plant is very dense and top growth totally shades the bottom, leaf drop in the shaded area may occur due to lack of photosynthesis. Is the plant old and in need of rejuvenation?