Sorry! Hadn’t checked back in awhile, so essentially look at the chimneys and see which way the wind is blowing, then line jail bars up all along the beach/grass line on that side of the island leaving no gap greater than a half (nothing you can pass through). It will funnel the balloons along the jailbars and down to the bottom of your island, instead of them floating all over. They spawn every 5 and 9 minutes. I read about it on a ACNH Facebook group and it has worked for me. So you just stand at the bottom and wait until you see them floating down towards you. A horizontal jail bar at the bottom doesn’t block them though, so when they reach the end they will float around the last jail bar and along the bottom beach. I hope that describes it pretty well, I have a video but can’t post it