it's all a cycle.as prices surge, mining equipment prices rocket. eventually hardware catches up to the prices and mining becomes less profitable. Less profitable means less people building miners, then price spikes again, rinse repeat.

You will likely be very profitable for the next 3 months until hardware catches up with demand, of which your monthly profits will likely look really bad. As long as you dont sell to fiat and hold the alt or convert to btc, your roi will be fine.

looking back i found that i made the most from months where profits from calculators were the worst. I converted ether to btc. My original ROI was 10 months, made it in 3 months. If you follow the prices and mining, it's the never ending cycle.