I think you have the wrong take. Preserving the culture and language doesn't lead to the things you are describing. Those results are separate. Examples you

I think you have the wrong take. Preserving the culture and language doesn't lead to the things you are describing. Those results are separate. Examples you should look to are how French has been preserved and protected in Montreal, Creole in the South, Catalan in Spain, on and on. Those places have managed to preserve their language and culture while also improving their standard and quality of life on par with modern western standards.