The USD is the currency used in 90% of FX transactions, so suggesting that China and Brazil no longer using it will lead to de-dollarization is premature. The USD has been declining in terms of its share of foreign exchange reserves, but it's still the most dominant currency in foreign exchange reserves as well (58.3%), so it being replaced by another currency is unlikely to happen anytime soon.
Note that as of 2022, the second most common reserve currency in the world is the Euro at 20.47%. The Chinese renminbi is a tiny percentage of the world's reserve currencies (2.69%). For those who think decreased use of the dollar is necessarily a win for the US' geopolitical adversaries, I have a waterfront property in Arizona to sell you.
https://www.bis.org/publ/qtrpdf/r_qt2212x.htm
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