There's nothing wrong predicting in the future, everyone does it and as long as you are not harming others with what you are saying there should be no problem at all. I'm against with what you said that you should only enter when you think there's a chance of taking profits. You are likely to miss the train if you will ever have that kind of mindset. Enthusiasts thought of profit too but there's no way to feel that you will have that chance of making profit.
It might cause falls into traps of FOMO, that in turn might result in dramatical losses.
Honestly, I have profits and losses in trading, and investment.
However, I always try to reduce the risks and maximize chances to take profits.
Of course, I can not do it perfectly, just try and learn from my mistakes over time.
For now, Ethereum has still been undervalued.