I also think that bitcoin is the safest way into increasing you capital, but it's also one of the most slower ways. There's a ton of money to be made off from
altcoins, which should not be ignored. You just need to exit and dump at the right time, and know when to hold for long. Then just exchange for bitcoin in the end.
Ethereum can still bring you profit from trades, but i would never want it over btc, especially now when its hyper pumped.