Why are countries ditching the US dollar?

Why are nations worldwide beginning to move away from the US dollar as their primary reserve currency? Is it due to concerns over the stability of the US economy, or are there other factors at play? Are alternative currencies, such as digital assets or other national currencies, becoming more attractive options for international trade and finance? And what implications does this trend have for the global economy and the future of the US dollar's dominance in the international financial system?