There are lots of altcoins(well, ICOs) Can anyone suggest some altcoins to buy?
I searched some on ICO listing cites, but it seems a lot of them are paid to be rated high. Some coins have only 100+ members on Telegram...

I know that the price will go up and down but how to find some altcoins that is really doing something revolutionary and worth to invest?
If you want to copy somebody's investments you should go to the social trading platforms and subscribe for copying somebody's actions. It would be much easier.
I do not even subscribe to someone entrusting their decisions on someone else's investment as this is the main reason why people have really thrown away their money over the years.
One thing with copying people is that you will never be able to make any decision on your own, and sometimes, even promising project fails and how do you want to know when this person you are busy following is trying to get out of such market eventually. Get to trust only yourself, have the basic knowledge you need to know when it comes to investment and be able to make decisions on your own as this is the best way you can get the best in the long run.