Trading of course. If you are good in trading and you know how to use technical analyses and fundamental analyses you can earn money if the market is fall down.
All that you need is a good knowledge and a good platform, where you can easily withdraw your profit, and be careful about Scammers, they are everywhere.
And if you want to start with ICO it is also a chance to loose all your investment, because you can deal with a wrong company.
And even if you have good knowledge in it you also depends on the market. So you can just go to church and to put a candle
Of course if you can predict the movements on the market you can earn money. But if you wanted to start, then you should start in trading.

ETH level is 753,19 right now, I can predict that during 2 month the level of ETH will fall down to 700 USD per coin and in this moment you can invest your money.  

Well , to be honest with you guys if you are not good in this and you do not know the market well it is better not to start.
If you can not swim, do not go to the swimming pool. 
Of course if you have time to serve all the information and monitor the market, you can try. But, if you see that you loose money and loose and loose it is not your's.
My best advise for such people, who are afraid of loosing there money and always panic, just find someone with a good experience and without fear.
Because only this person can make money, just believe me. It is always better to have money even if you are don't earn it by yourself, then to be a hamster with zero on your wallet balance.   

interesting assumption
but 50 thousand - it's overkill
25 thousand is quite possible

Because if you try to adapt to the market, then you just lose everything.
There are too many speculators on the market who try to play on your fear

Social networks - the most effective method of advertising today. Of course it should be used.
What can be more effective than targeted advertising?! 

-people are afraid of everything new
-people are afraid of change
-the people of the old school are afraid of money that can not be touched 

Of course, it will change the world, but what would have happened is that the governments should legalize it! 

Without full control, government will never legalize BTC
What about taxes? How to fill the pockets of officials? I do not know what's going to happen, what would it really happen 

I think we need to keep the BTC now
most likely by the end of summer will begin a strong rise
although it all depends on the purchase price

Great news. I hope other countries will follow suit in the near future.
I would like more opportunities for cryptocurrency

Not sure, too many people will disagree. To be precise, all people who control fiat money
But on the other hand, if the cryptocurrency is gaining enough popularity, everything will be possible

I think the price will increase strongly only by the end of summer and then the situation will be repeated, which was in 2017
a am for HOLDING