Just thinking a little out of the box here, but might going to loud venues work to exercise your weakness best? The hardest place for native speakers to communi

Just thinking a little out of the box here, but might going to loud venues work to exercise your weakness best? The hardest place for native speakers to communicate is in a loud bar/club where you really have to actively listen and can barely hear the other person's words even when you're close up. Going to loud bars and clubs might be an interesting way to try and learn to understand the other person even when it's very hard to hear what they say. If you can master that, you can communicate anywhere. As a potential alternative, maybe try picking up some kind of ham radio communicating as a hobby and work through trying to communicate with garbled long-range voices that are hard to easily understand.