Why are my distributions reducing in number?

This is because the Green blockchain is growing and adding additional node operators.  The total daily distributions are divided among the total active nodes.  As the number of node operators grows, the number of distributions received by each node owner will decrease.

Another reason might be due to the halving of Green.  The Green Smart Contract is designed to half every year in July.  This will result in halving the distributions to the entire Green community.