Remember, diversification is key! Not just within cryptocurrencies, but also across different asset classes. Altcoins are but one more instrument in our investment orchestra.
My take on diversification is that one must have assets classes of traditional markets along with bitcoin in the crypto section. Doing crypto should not indicate the altcoins that have been launched recently or have been making the news. Its more of the ones who have been in the market for long if I stretch it.
There are bonds, stocks, real estate which are profitable for the long term too, they are here to stay even if bitcoin goes huge. But keep altcoins as limited as possible.
Just dont spend your money on HYIPs and MLM schemes, they are bound to make you lose.