when microservices start failing, like dominoes, what are your best tricks to keep things from completely falling apart?

hey all, been thinking a lot about system resilience lately. we all know microservices can be great, but one thing that keeps me up at night is how to prevent one service failure from taking down a whole chain of dependent services. what are your favorite patterns or tools for handling cascading failures? are circuit breakers enough, or do you implement other strategies like bulkheads, timeouts, or specific retry mechanisms? curious to hear whats worked well in practice.