If you want to improve the scalability of your Hyperleder Fabric Network for accommodating higher requirements, you may want to look at a few different processes to do that.
One way is to increase the count of endorsing peers and subsequently distribute the overall load of those endorsing peers across the larger peer set. This will not only help you accomplish your task but also revamp the throughput of the distributed system.
If there are multiple channels that are supposed to execute concurrently, have separate endorsing peers for individual channels. You may also upgrade to updated and faster hardware that has crypto acceleration for used algorithms. Keep your software version updated too.