Hello, teacher!
You can build another version of this project using the modular monolith architecture combined with DDD and CQRS, replacing MediatR with DispatchR.MediatR. Each module will have its own database (similar to a microservice approach), and these modules will be able to exchange data either synchronously or asynchronously—just like in the repository below:
https://github.com/meysamhadeli/booking-modular-monolith.