Unfortunately the reason is not this, changing pools will not solve anything because what is causing the decrease in the rewards is the increase in the hashrate and a momentary reduction in the value of the fees.
The fees are still pretty high in my opinion. Even though the mining rewards are a little lower the fees are high because the price is almost $2200. Basically even with 100 Gwei which seems to be the min fee these days to send a regular transaction ETH costs $4 and for ERC20 is over $12. This is still expensive.
I think the lowest i've seen the fees is 80 Gwei. So due to all these smart contracts the network will keep being conjested and we will have an average fee of 100 Gwei for the next few months. At least until the DeFI and NFT starts to calm down.