Well, there is strategy called Average down! If you had been using the strategy you may not have lost so much. It is not late now. Double the units you have in all these coin. Any 10 % to 20% increase in price will automatically put you in profit! Keep buying the deep and you won't lose a dime at the end of the day!
A Perfect advice for those who are holding Altcoin
That's absolutely mental, why on earth would you invest even more in a token that's lost so much? Cut your losses and learn the lesson.
A better strategy is buy in chunks not all your eggs in one basket. Say a coin is worth 10 and you think it may go up to 12. Buy 25% of what you wanted to invest.
Day 2, it's now at 8 ok buy another 25%
Day 3, it's now worth 5 - At this point you can either go the full remaining 50% if you think it's at it's bottom or continue with the 25% investment again.
At end of it say the ending price is 7 by time you've blown all your funds. You got some tokens above that price and some below so you may be slightly up or slightly down.
Of course this also works in reverse, profits will be less as well. But your not going 'all in' at a certain price.