Voice Isolation

hey. im not sure if this is kind of realted to this club but maybe somebody knows about this.
soo, i recorded my friend গান গাওয়া in a room but there are too many other people talking too hear what i wanted to record. i was wondering if anyone can tell me about how to maybe isolate the other voices to hear what i wanted to record?
if আপনি know that would be great.
thanks!