You can try forex if indeed they accept a deposit under 10 $.
You can trade but it will not be profitable because profits are based on percentages, so it will not be profitable with a small value.
or you can try gambling
No amount is small. $9 worth of Bitcoin in 2012 is now worth $15,000. So you never know what will happen in the future. I am not expecting what happened in 2012-13 to repeat again and again. But I still have trust in cryptocurrency and I am holding on to most of my coins. Who knows? $9 of today may not grow to $15,000 tomorrow, but there is a real chance that it may become $90 or $900.