Unless you are live converting as you are paid out you will never reach the profitability you think. Chasing profitability will cause you to lose out in the end, do reasearch on a coin you think will be going up in price and then mine+hodl it. That is how you make money in this game. What you are trying to do is effectively chasing your own tail.
Not true. It not good to auto switch between most profitable all the time and between pools all the time but it's good to mine most profitable for 1-2 weeks and then switch if the new one is already 30+ per cent more profitable. Then you exchange at higher peak to the coin you believe has the potential and HODL.
I think everyone has the same question at this time "which coin." I agree with fanatic26, do research. But not only about the future prices, but also how you can optimize to mine that coins.
And the best answer today is:
can you give a coin that profitable to mine?
You're naive as soon as it appear in here, it's no longer profitable...