Haffulawl is correct. The founder of ETH is switching from “Proof of Work” to “Proof of Stack” in ETH 2.0. For those of you who don’t know, Proof of Work (PoW) requires mining. Proof of Stake (PoS) does not. ETH 2.0 is shifting over to PoS and miners will no longer be needed. The rollout started late last year which is clearly reducing mining returns. Eventually no one will be able to mine ETH anymore. It has nothing to do with your hardware, but everything to do with ETH 2.0 going to PoS.
Do a Google search for “ETH 2.0” and “ETH 2.0 mining” and you find numerous articles about the change. In fact, there is a group of miners talking about doing a 51% attack on the ETH blockchain to prevent ETH 2.0 from being fully implemented. Also, mining pool operators have taken positions both pro and con on ETH 2.0. Do some research and you will discover why your mining results for ETH are diminishing.
From a business perspective in your mining, you should be looking at other coins to mine. That is, find alternatives for your mining operations and don’t rely solely on ETH. I heard about ETH 2.0 last year, so I have been looking at other coins to mine and testing them to see what they will produce. Examples are Litecoin, Firo, ZiIquilla, Ravencoin and others. I am prepared to switch over from ETH to other coins when ETH drops to point of no longer being profitable. I suggest each of you do the same.