When should you break up a monolith into microservices?

hey evryone im wrestling with a common dilema when is the right time to start breaking down a monolith into microservices our current system is monolithic and growing and while it works the dev cycles are getting longer ive seen many teams jump to microservices too early and create more problems than they solve what are your heuristics for deciding when the benefits of microservices outweigh the added complexity are there specific metrics or signs in a monolith that indicate its time for a change