Have they tried securing access to large amounts of cheap energy? It is a bit of a win-win because either GDP goes up and case closed or they can sit back and relax in luxury mulling why GDP didn't go up despite massive increases in the general prosperity.
Energy isn't the entire story because there also need to be people around who know how to transform it into whatever you want, but it is a rather important part of the puzzle. After that, freedom and education are probably going to make up the rest. What else is there? I suppose land ownership.
The puzzle isn't that complicated. We all know what comfort looks like. Asking how to make GDP go up is the wrong question, it is just a tool to point out when policies are wasting resources. More waste -> less GDP -> notice that and waste less -> reorient to secure prosperity.