Most of the users here are regretting not buying at the lowest price of a coin but do you really know at that time that it really is the lowest price of that coin? And Vice-versa...
It is much worse to buy a coin at the maximum price and then wait for years for the price to return to its previous values or sell it at a loss. So, it is better to sell the coin, as OP did and make a profit, than to sell your coins at the lowest price, while losing your deposit.