BTC and STEEM is always a safe bet.
I would recommend you to study/invest the following:

• Siacoin (descentralized storage, cheaper than other cloudhosting services, has the potential replace torrents, also this coin is massively undervalued... because of the claymore dual eth/sia miner this coin is very well spread among crypto miners and users)
• Lisk ( it is very similar to ETH but it is written in javascript and will scale with no problems even if there are over 10 milion tokens/assets, because of the sidechain technology, unlike ETH, and it is very well distribuited)
• an anon/privacy based coin (anyone should have in they're long term portofolio one of the following: DASH, XMR, ZEC, XVC. Anyone of them is a good investment, but you should make your own research and invest in at least one)
• Byteball (this coin was launched without premine or ICO! and because of the DAG technoly it scales well and supports global level transactions while having very low network fee. It already has working open-source bots that are smart contracts like the "Flight delay insurance bot", or the "BTC/GB trading bot". It is very lightweight and you can join the testnet to get some non-value bytes and try it out )

!!LATED EDIT: ALSO WHEN YOU STUDY ALCOIN PRICES, YOU SHOULD ALWAYS VIEW THEY'RE PRICE IN BTC NOT USD!!