How to scale non clustering services

i have a router that all my micro services connect to, it currently does not have any clustering support /functionality.

i can scale the micro services just fine and the router will load balance across the services.

When i need to scale the actual router how can i tell the new micro services to connect to the new router and insure both routers have sufficient services connected to them?

is there a service grouping option in compose that i can group services together, maybe scale the groups and networks together? controlling visibility with networks?