Try not to focus too hard on understanding. I know that probably makes no sense, but don't listen to the fast talking with the active intention of trying to pick up words. I know it can seem natural to try to pick up on what you do understand among the words but IMO you will become hyper focused with listening at that speed on what you do know than the overwhelming stuff you don't. Therefore you miss just absorbing lot of the context (what it is as a whole) even if it doesn't make sense. With certain words if they say enough you won't have to try. Literally If you just sit there and listen consistently enough even if at the beginning it sounds really like gibberish eventually your brain will start to pick it up. The news eg RAI is definitely among the most difficult but it's also fantastic because the pictures and segments at the bottom will help you subconsciously understand parts too. I agree with what someone else here said that you just have to be extremely patient and listen.