The El Salvador need to buy more Bitcoin that will worth more since they are the first impression when we talk about countries that are supporting and allowing their citizens to use Bitcoin as legal tender. This is a good move for the El Salvador people because this is going to make the country more richer by the time the price hit $150k.
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Buy more with what money? Their government borrows money from the IMF and others to ensure the survival of the state, and you expect them to buy more than 1 BTC per day, which is over $3 million per month. Even today they start buying ten times more (300 BTC per month), it's not an investment that can save them considering the debt they are in.
What El Salvador failed to do was to buy a lot more BTC from 2021 and in the years after that, so if today instead of 6000+ BTC they had 60 000 BTC, that would be a slightly different story.