You need to be patient because that is the best way to maximise your profits. People say that you should buy the dips and it sounds like you did not do this. Now that we have a dip it is a better time to buy cryptos as there is more chance of increasing profits.

Now all the crypto-currencies are falling, and people are panicking about selling their COINS. I've lost a lot in the last few days, and the altcoins I hold have dropped a lot. I won't sell now, I can only hold.

You need to wait patiently. You need to clearly analyze the growth and economic potential of the currency in crypto before you invest in them. Do not look at its reduced value that decides to invest.

yous mistake is bag holding altcoins.
you should never do that. the right way of doing it is to only trade then while they are getting pumped and are hot. otherwise you will only be wasting your time and money like this and will contentiously lose money as they continue getting dumped hard..

Yes. Never go for aggressive buy or trade. Rather be patient and watchful to purchase. After purchasing, do not sell randomly at a silly price fall. Rather control emotion and hold firmly.Have patience and buy more to average price if possible.

If you don't sell, you didn't lose.
HOLD
Hold until it goes back up.

Stay on the forums, learn that ICOs are NOT bitcoin.  ICO = Initial Coin Offering, when someone is selling a NEW alternative crypto coin, in exchange for bitcoin.   Nobody bans Bitcoin.  Not China, India, Google, Facebook, nobody.  They are planning to ban ICOs in the future.
ICOs are NOT bitcoin!  Read what I just said.  ICOs= A sale for Alt coins.  NOT bitcoin.  Most ICOs are stupid bullshit.

Start helping your investment by teaching new people, like yourself, that ICO is NOT bitcoin, so that people stop spreading negative rumors about bitcoin when people are talking bad about ICOs.

And remember I said hold.

the best thing you must do if you want to get profit when investing is patient. if you cant control your feeling, you are easy sell in panic and lose your chance

What is with all of this new investors which want haste with all their investments?

What is all your hurry? Just the word "invest" defines it all. It is like planting a seed. You wait for it to bloom. You water it and give it sunlight or you just let the nature grow it because they can.
Same with investing, you are nurturing it with your patience and if you can stretch more time you can advertise it to pull more investor.
It is like 1/100 people who enters the world of crypto are just the ones optimistic enough to HODL their coins.