Ethereum continues to give the largest % of mining revenue by far
Only if you're a plug and play miner who will all have a very bad time in the next few months and will shake you out of mining - even with very cheap electricity - until the next big thing comes out for a few weeks, maybe months.
Personally, I don't even remember the last time I mined Ethereum.
Ethereum is earning on par with Equihash right now, especially considering Nvidia miners are locked to Nicehash's miner. Apparently Ethereum armageddon was moved back to next year.
It would be nice if there was a 'next big thing'. I have heard about anything coming out since Zcash.