Backend stack with microservice architecture

We migrate to microservice architecture.
Well, I understand a lot of principles like one service – one db and it is a not a problem, we search a problems in our architecture before realization.
I want to create api-gateway with graphql and subgraph for every services like: tasks, orders, clients etc.
P.S. Sorry I bad speak english

Subgraph will send queries to microservices and collect all needly data for response.
Have an idea for upgrade it schema, make it better or use another technologies.