Down the road into a bear market what can a new miner except from a 500MH mining farm? How incredibly bad can this get? 5$? 8$? Asking those who are here before in 2018 so I can know what's awaiting me.

I know that EPYC and Threadripper CPUs are the best for CPU mining and I am able to have a threadripper CPU with 16cores, can I use this to mine some Ethereum in this bear market or it's not worth it? I have free electricity but my aim is mining difficulty.