Why no just invest in bitcoin, it is the most reliable. You can go for some altcoins too, but you have to be very careful while choosing altcoins because some may not yield any profit, some may yield just little profit, some may result to losses. If going for altcoins, just let little of your portfolio to be altcoin and have like 70% or more on bitcoin. Avoid new projects, they are scam, look for better ones with high marketcap on coinmarketcap.