It's more mental than technical. PAK young players are groomed in domestic system which is comfortably inferior to the Birmingham or Lancashire league; hence young players are not developed to compete at highest level. You'll hardly see any PAK batsman bloosming before 30 in recent times - that's after 5/6 years of international cricket. Ideally, a batsman should be at his peak betweeen genuine 23 to 35; for PAK players, that starts from genuine 29.
Second problem is, every team works in your batting - take an example of Malik. After his 245, I categorically wrote that he might fail in next 5 innings, because now Poms have 10+ hours of his batting footage. There are several PAK youngsters that started with a bang - that's natural talent/skill what ever you say; only to fade away in a year or 2. This is where County cricket came till 80s - youngsters with natural skills were hired by Counties after 1 or 2 good knocks on potential, then they were groomed in to pro, who could tactically counter the bowling - its like a game where bowlers constantly trying to find holes, batsman constantly trying to cover the hole, until another one is found.
Besides, in olden days, PAK FC was played on belters, which at least helped batsmen to play long, long, long innings, while pacers had to beat it through speed in air & spinners had to flight it. Now, it's a 250 overs joke which doesn't help preparing batsman for longer concentration, neither bowlers to find a way to get batsmen out.
Babar's only chance is to learn from Mickey on job - that's Test/ODI for PAK, & he has to do it from 3. It's like learning swimming - in Canada my kids will learn from swimming schools where they'll be given proper instructors, costume, guidelines & safety measures in the process - I learned it in my village home after swolling enough pond water. My uncle used to push me into pond & one day I found that somehow I have learned how to keep my head high above water; but I can't tell how it happened, neither my uncle ever told me how to do it - I just learned from my instinct of survival. Sadly, Babar can't go to his uncles (Basit Alis) in this regard.
I believe, he'll come good in 2nd innings - one last chance in AUS. Virat also struggled in his first few Tests in AUS/ENG - but he had mentors to guide & system to polish his skills - Babar has to invent his way of doing it, himself, may be only Mickey can help him.