As well as doing IELTS listening test practice, anything else that you listen to in English will help to improve your 'ear'. I recommend using websites like YouTube for daily listening practice: choose a topic that you find interesting, and search for videos about it.
For example, I'm interested in language learning (of course!). Here's a YouTube video that I found and watched yesterday:
If you found this video interesting, watch it a second time and note any new or useful phrases that you hear. If you didn't find it interesting, search for something different. As the speaker says at the start of the film, the key is to expose yourself to as much "comprehensible input" as possible!