What motivates you to revert from a microservices architecture to a monolithic system?

The return from microservices architecture to monolith can be caused by several reasons:

• Management complexity: microservices require a developed infrastructure for orchestration, monitoring, and deployment. If the team is small or lacks resources for support, a monolith is simpler.
• Performance issues: inter-service communication over the network adds delays. In a monolith, function calls are faster.
• Lack of clear service boundaries: if services are too tightly coupled, microservices architecture loses its meaning.
• Difficulties with transactions and consistency: in a monolith, it is easier to implement atomic operations.

For example, if the project is small and does not require scaling, a monolith will be easier and more reliable to maintain.