A idiomatic term that describes a mentality that is supportive and empowering

Solution 1:

Here is an idiom that doesn't mean exactly the same thing, literally, but which expresses the feeling I think you're aiming for.

can-do

willing to try different ways to solve problems and confident that you will succeed (always before noun): *Her can-do attitude is the reason we chose her for the job.*

(Cambridge Idioms Dictionary)

I am fed up with the crab mentality that was so prevalent under the previous administration. Mr. X's can-do attitude has already set the tone for a new way of doing business in Country Y.

Solution 2:

altruistic support refers to unselfish concern and active support.

"I would like to thank my brother for his altruistic support, encouragement, and belief in me and in everything I do."
"This study was conducted with the altruistic support of two great teachers who I wish to thank..."
"Consumers do not buy simply out of altruistic support for those who need to increase their sales revenue."

Solution 3:

Although the person who had asked the question has already chosen an answer, however, even that person and other visitors to the site may find the following information useful:

Transformative mentality

The Cambridge Online Dictionary for advanced learners of the language defines the term transformative as follows: