Try playing with configtx.yaml, crypto-config.yaml and docker-compose files to customize your network and understand what you are doing. Customize your organizations, your consortiums, your ordering service, your peers... Create your channels, join them, update your anchor peers and understand what you are doing.
After that, if your network had one orderer, deploy a new one with more than one (with Raft consensus). If your network was using cryptogenic, deploy a new one using Fabric-CAs instead. Or you can follow by playing with chain codes.