Option 1: Investment in BTC or ETH only.
Method 2: Use BTC to buy Altcoins.
Method 3: Use ETH to invest in ICO.

Right. Because ETH's Smart Contract is an ICO development platform.

It's correct. BTC is the king of Crypto. Without the king, the soldiers would have no one to lead.

If you really want to invest, make sure you do not invest in short-term. You must really trust and learn about the project. For me, if I invested, I would have to make a high profit.

I participated because I wanted to bring high profits. Before investing, I thoroughly studied the ICO I planned to invest. I can't deny that all people want to make a high profit for themselves.

Everything is possible, we can not predict. But losing ETH to $200 is very unlikely, I'm still looking forward to ETH's radical change.

What is this cryptocurrency problem-solving?
This is the most important factor to determine if the cryptocurrency is of permanent value.
What problems of the company (cryptocurrency) solved? Is it worth the real world or just a good idea?
Also, consider the development team and the person running the program. Do they have a long-term vision for money? What do users think about money?
By asking these simple questions, you will begin to discover what cryptocurrency may be worth in the future and which cryptocurrency will collapse and disappear.