We have noticed how aussies defended their consecutive 300 plus scores with huge margin against sri lanka and bangladesh. What we can learn from them is that allways bowl at stumps. You miss i hit. Yorkers or good length deliveries allways at stump.
You need 10 balls to dismiss your opposition. Look at Australia they use lesser bowlers in between Starc and Cummins. Zampa,Stoinis,Maxwell and Coulter-Nile all bowled between Starc and Cummins.
But Sri lanka team dont use that strategy. Our main bowlers are Lasith and Pradeep. Better use Thisara,Udana,Dananjaya in between those two. Even Dimuth can bowl over or two. You have to be wise when you do bowling changes.
We have noticed at the death our bowlers try to minimize the runs. But instead of defensive mind set. It is better to be brave and attack the stumps. No matter how many runs are scored be brave to attack the stump. Be aggressive. Good luck.