The best time to sell altcoin is when btc increases slowly. We will sell it and get it. I trade a lot and I see that!
Market is not accurate situation to sell them because bitcoin price reduced a lot in the market and it is effecting other altcoins. We have to wait some more time when bitcoin price start increasing all other coins price start increasing.
You can never be accurate with getting out of a market but as a trader, the thing is to look out for those moments when there is a sell signal and really those are the things indicators are good for anyway. A lot of people get carried away by FOMO that they just would not want to miss out on the market going up the more and lose the potential profit they could have had. The best is to just have a set target and stick with it.
When your grandpa told you to invest in bixcoin
Most times in an uptrend, even when one's grandma or grandpa can predict the market, lol. In a way, it is always better to be sure to see an uptrend signal before entering any market and most especially for altcoins. The problem is that some traders always want to catch it low to be able to get the best price or wait for the peak to sell to get the best price, but the thing is that strategy should always be used in doing any of these things and it should be a safe one.
Same like other cryptocurrencys markets the Altcoin should sell at high market in order to sell the coins at high price and results in profit otherwise selling at low price lower that the buying price will result in loss, clearly. Now apply and obey the market rules and principles that will tell you to sell the coins on a high market price. If you are in a stage of long term and now the prices is high then sell and if you are buying the coins now then this is a better time to invest.