ETH is not so strong as it was so investing will not be unnecessary there at all. I likek its value but price of ETH has very low level now, I want to see it increasing.
Actually it's always depends on your motivation. Is it for long-term or short-term investment? if your answer is for the long term, it doesn't matter when it's good to buy or not because basically the long term is just waiting for prices to skyrocket. and if you make a short-term investment I strongly recommend watching the market so you know when to buy and sell. Thought?