Since the rise of his designs, frank lloyd wright an icon of modern architecture

Since the rise of his designs, Frank Lloyd Wright had become an icon of modern architecture .

Explanation:

Frank Lloyd Wright was one of the most important professionals in the United States and the world. Idealizer of more than a thousand projects, he left a revolutionary legacy and created the concept of Organic Architecture, which proposes a new relationship between construction and environment. He has become an icon of modern architecture thanks to his talent and genius.

it makes them feel like hes not confident

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this would be in the imperative mood. it is a category of verb forms that are used to express orders,instructions,commands or requests.