El Salvador is a country that has adopted bitcoin across its entire economy, not only investing in it but making it a legal tender. But after 4 years, let's see how their economy is. Their economy is on the brink of default and has to seek help from the IMF.
Their country has many nation-wide systematic problems so Bitcoin can not fix all such systematic problems and help El Salvador become richer, safer or whatever better aspects. Nayib Bukele actually has governed and led El Salvador to a good direction and this country has been changing positively but it comes from combined initiatives, not solely from Bitcoin. Their economy can not be improved only by their national investment in Bitcoin or legal regulations like Bitcoin legal tender.
Bitcoin is just a currency, an investment asset, and it may be useful for an individual or company's economy, but it does not help the national or world economy.
El Salvador has tried to build up things around Bitcoin after realizing Bitcoin potential and knows that if they succeed to make their country as a heaven or at least one of most favorite destination country for Bitcoin users, investors and companies, their economy will get benefit from it.