Hello guys!, In your years of experience investing in crypto, aware of its volatility, what coin or token maybe you regret selling the most? Maybe today when you look at the market you cry because maybe the coin you sell last month is life-changing in price already. 
we know every speculation is always at risk. about the problem of profit or loss it is common in a stock exchange.
I think you do not have to regret when you sell and now its value is higher. Well, you can wait for it to fall back and then buy it again. there are many techniques you can do.