Use of local currencies is certainly on the rise, but the problem is lack of bilateral financial trust caused by various factors, including capital controls. There is the recent example of Russian companies being unable to get rupee-denominated profits out of India, they had either to buy something from India or invest money there. China is also quite strict with its onshore RNB flows which is multiplied by risks of secondary US sanctions.
Honestly, I am really surprised that BRICS+ countries haven't yet developed a gold-based settlement system centered around central bank reserves. My main guess: such system would work fine with a more or less balanced trade, but many countries intentionally pursue the export-oriented model, which would work poorly with such system.