Firstly consider the the impediments to a freer and more prosperous future. Reconsider or remind ourselves (or, in the case of younger people, discover for the first time) the ideological principles which underly Western civilisation and its amazing successes.
These are, variously, the spirit of free enquiry which produced modern science, and the construction of stable institutions which could enforce contractual obligations and thereby encourage commerce. In the specific case of Britain the latter point would be labelled "Common Law" which is why everybody in the world wants to go to the UK, Australia, Canada, New Zealand and the USA to live and to do business and nobody from any one of Britain's "colonised" territories wants to go and live in Eritrea etc.
And, in answer to the OP, oppose fascist ideologues who wish to suppress free speech and embrace and copy the winning formula which produces health, wealth and freedom.
That's my advice to poor countries who aspire to be better off.
My advice to Western countries who are at the moment well off is be careful whom you invite into your home.