The power structure is designed in such a way that it is difficult for the Government itself to do change anything.
Here is an incomplete list of reasons why I would never get involved directly in politics:
1. It takes literally decades to get a political party off the ground without major backing. All the new parties that you hear of are bankrolled by elite backing.
2. The way the Government and the civil service is setup is designed so you can't actually make any changes. Dominic Cummings has many interviews he did in the last year you can find where he explains how Whitehall is fundamentally broken. I suggest you listen to them.
3. I have a chequed past. Most of my adult life I was abusing alcohol, and as a consequence of that I have done and said lots of stupid things. A good portion of my extended family are criminals (which I don't associate with for obvious reasons). If I or anything connected to me gain any public appeal at all, I would have all the muck which I've put behind me dragged up. I don't want to expose myself or my family to that.