Unfortunately, your calculations may be incorrect. Bitcoin is growing at the expense of altcoins. Ethereum does not follow BTC as we would like. There are many tokens (including scam) that take off money from ether, thus ETH ATH should not be expected anytime soon.
So, if mining, then you need to achieve maximum efficiency now. The threshold of 10 c still allows mining to continue in some countries.
I think Eth has room to run, but not like it did in Jan 2018. Shitcoin ICO mania isnt going to pump it like that again.
My calculation is not based on ico's, if you think that is why eth rose in 2017 then you must revise your calculation, my calculation is based on supply and demand day by day and possible scarcity of eth when a determined price is hit too fast. ETH long term holders comprise of around 70% x 20% of bitcoin. Like I said before, there is a possibility eth will be 0.3 btc in few months and possibly hit 0.6 btc in few years as eth holds 99% of dapps projects and alike and that is where the world is going.