9$ is too small for investing , better we grow our money with some short time trades, also it's good for gaining experience from trading so when you already has much money , you can trade safely. make at least 100$ and do invest, before you reach that point better use it for trading altcoins with top 20 altcoins because the price not so agile best for new traders
But it takes patience and time so that the funds can grow because the capital he has only 9$. If he has more capital maybe you are right, better short term trading or can take part in bounty, airdrop, contest, etc.