For how long are you willing to mine Ethereum? because very soon your mining rigs won't be able to mine Ethereum because of the upcoming upgrade called ETH 2.0, the only way to get Ethereum will be through Proof Of Staking algorithm
You are misinformed , ETH 2.0 will be in multiple phases and will take years to fully switch to POS. Most likely phase 0 will launch this July, which wont nearly affect POS where 60 blocks will be POS and 1 block POS. It means ethereum will be hybrid POW+POS. What developers thing it will take minimum 2 years to fully switch to POS