"Try to listen to really hard accents like Autralian, Indian or Irish for example"
Jessen, whether an accent is "hard" or "easy" to understand is totally a matter of subjective opinion.
People will find any accent "hard" if they are not used to it.
Likewise, people will find any accent "easy" if they are used to it.
You can't issue sweeping judgments and label certain accents as "hard" based on the fact that you personally find them hard. Other people may find them extremely easy, and consider them to be totally neutral.
Native speakers of the particular accents to which you refer doubtless all consider their own accents to be totally neutral.
This is because everybody's accent always sounds totally neutral to him or her.
Whether or not foreigners find any given accent "easy" or "hard" simply depends on how long they have been exposed to it.
The ear will adapt to any accent given enough time.
P.S. There is no such thing as a "basic" English accent. English (like all other languages) has many different accents.
The way to get good at listening is to listen.
The way to get good at speaking is to speak.
The way to get good at reading is to read.
The way to get good at writing is to write.
It's not rocket science.
Find a short speak on youtube, say 3 to 5 minutes long on a subject that interests you, maybe TED or a newscast.
Listen to it 40 times (i know. painful..) as you listen try to repeat the words to yourself, after 40 you will be sick of it but you will be able to hear every word.
Repeat with a new one
Sorry but drill is drill :-)
