BTC has gone quite far.. from 1k a couple of months ago to 6k today.. that's a 500% increase, which is insane for traditional investment alternatives out there right now. If you don't have a lot of capital to invest, you're best chance is to go for Altcoins as you've already mentioned, and Ethereum is definitely a good pick from all other alternatives. The current implementation of Ethereum and all the adoption from developers makes it a very attractive altcoin, and it might even surpass BTC at some point in the future. It's such as good coin because it differentiates from the main coin (BTC) and offers a completely new "window" of oportunities. These are starting to be implemented nowadays in forms of projects (all these ICO's you're seeing going around) and some of them will eventually be very successful, once the median consumer gets their hands on it. In these terms, Ethereum is definitely a good investment if you're looking for higher returns than BTC (I believe it will perform better in the future due to it's many problem solving abilities, which BTC is kinda limited unfortunately).
Thank you for your reply, I'm researching on ICOs and Altcoins as well. But how can I trust to ICOs? I see a lot of scams out there!! What's the best way to detect them and invest on real ICOs instead of fakes? All of them have roadmap, whitepapers and a lot of advisers help them! Are they helping fake projects!?