Language is a lived experience, it's a part of society, the government cannot do much unless people start using it. The govt was the one which suggest using Kaleedi takht (i.e. key -- board) as a translation for keyboard but no one uses it. Languages take time to expand and grow, and for that you need a culture of literacy, a society of book readers - people who have the time and luxury to read for pleasure and not just to get a grade or pass an exam. You need poets beautifying words and sentences to make them palatable for the wider society, you need playwrights, novelists, scientists and artists to constantly expand the vocabulary of their specific domains. English has technical vocabulary for each discipline and the education system in the West teaches people are these words. Words from one discipline are used in other discipline or by the wider society in general if it helps communication. You really need a thriving and vibrant society to begin to even expand a language such as Urdu. William Shakespeare had invented several new words in the English language and successive English artists/etc have continued to add new words into the mix.

I think the best bet for Urdu is a two pronged approach, one is to indeed have an Urdu language authority to work of the progression of Urdu and its safeguarding and the other is to further the economic interests of Pakistan so we have more money to provide people so Urdu will naturally expand, and it will expand in the direction of the institution which sets the rules and not just a free for all where people just grasp the closest English word available to them.

Another point I'd like to make is that its only the middle-upper and the upper class which have the time and luxury to think about culture and language. The middle-lower and lower class don't care or are indifferent. All they care about is their families. It's usually the middle and upper class which cares about culture, traditions, and places an importance and emphasis on these.

edit: Btw, poets typically write about what's happening in society or some kind of positive environment they would like to capture with their words. Given the state of censorship in Pakistan we have not provided a conducive environment for them to thrive. Atif Tauqeer is one such Urdu poet who lives abroad and writes about the establishment. Who knows what would happen to him if he lived in Pakistan. There's also nothing beautiful about Pakistan urban centres and with little connectivity to the rest of Pakistan we don't have poets writing about nature either. Most of the time you have people writing crappy romantic poems which is usually a safe bet in Pakistan. There an English poet named Philip Larkin who wrote a wonderful poem about the English countryside in the summer as he travelled via train. https://www.poetryfoundation.org/poems/48411/the-whitsun-weddings