Increasing Availability for a Kafka Cluster

Hi,

Currently we are running a Kafka Cluster with the 3 brokers. Replication factor of 3 and minimum in-sync replicas at 2. I am planning to add a new broker and increase the replication factor to 4 while keeping the in-sync replicas at 2.

What are your thoughts on this? I am approaching this correctly?
Out of curiosity, can you describe your current Kafka deployment?