Hello,
I want to invest in some altcoins now for long term. If i make 100% gains on altcoins and BTC correct -50% i am actually on zero profits and i think it may happen in near future since BTC has more and more competition.
Sorry i picked up one question in you're post i think it's a lot of question you have.
For long term i strongly recommend with you those coins who top 5 and have big value in crypto market cap, like BTCH, XRP, LTC, ETH and NEO thesoine are the coins who have a big potential for long term especially litecoin i know this coin is next to bitcoin.
Good luck for trading if i where you choose wisely or read platform for strong fundamental coins good for long run.