When we are having more options to trade, we will have risks also distributed and it will get chances to have some consistent returns on daily/weekly basis.
But still there are many places if we analyze it well, for example forex, ico and altcoin trading is a large range.
For someone 20 bitcoins is a huge money but for hard worker traders is a good starting amount.
also do both a day trading and long term trading style to maximize profit and avoid losing too much
having multiple exchanges also always recommended
besides to take advantage to do an arbitrage trading , also to avoid something unexpected like what happened to mt gox and bitfinex.