If I were you, I’d just call a pest control service to get rid of them. Anyway, it would be more effective, I guess. I have a friend who works at
https://enviropcs.com.au/, who advised me to do pest cleaning once or twice a year instead of buying wasps. Anyway, it’s up to you. Btw, how’s it going now? I’m curious about it. I’ve seen some videos of wasps attacking the flies, and it actually surprised me. Btw, can these wasps attack you? What to do to prevent it? Keep us updated on your issue. Waiting for your reply. TIA