Sounds like you’re doing it wrong.
I used to live in flats with balconys and upstairs were having a party, largely out on said balcony, it was around 1am before I cracked.
I went out onto our Bacony, in dressing gown, and started shouting (only in that very British mildly raised voiced kind of way) to “keep it down a bit, we’re trying to sleep” .
Increasing the volume each time, I failed to get a response of any kind, despite them hanging off the balcony and me having to have been at least a little bit in view. I lost it. Picked up my trail building shovel and start smashing it against the floor of their balcony. Music stops, more people rush over, just as I shout at full volume “shut the **** up”. They went out after that. 😮
Crazy guy with shovel in dressing gown is the only way forward in these situations.