Ideal no. of shards and replicas

I have created 3 nodes on single server at single geolocation
Planning to add 2 more servers in next 6 months at 2 different geolocation
and 4 more servers within 1 year at 4 different geolocation

so in total there will be 3 nodes X 7 servers = 21 nodes

Currently whenever new index is created by default with 5 shards and 1 replica.

Please suggest default no. of shards and replicas are ideal and/or enough for this setup.

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