I would say that buying coins at the peak of their price is just as silly as switching from one coin to another just because it is in the top mining calculator. You decided to invest these money in one or another currency, you need to analyze the market and buy it only when there is a growth trend and sell when the reverse trend. On some exchanges there is a cool chip "Stop Loss". Why am I, whoever never comes to the pump and does not sell on the dump, always need to fix earnings or loss and not wait for future turns of fate. Unfortunately now it is difficult to say, we will see eth growth in the near future due to lower rewards for the block for miners. My personal opinion is not.