Hi @Basil_Abraham,
Did below parameter do the job for parameters wiredTigerConcurrentReadTransactions and `wiredTigerConcurrentWriteTransactions in atlas ?
The Connection Limits for Atlas Clusters are from the net.maxIncomingConnections configuration option. Attempting to change wiredTigerConcurrentReadTransactions and wiredTigerConcurrentWriteTransactions server parameters won’t increase the Atlas connection limit. You’ll need to select the cluster tier that matches the connection limit requirement for your application(s).
Hope this helps!
Jason