amazon onsite prep

i’ve amazon onsite coming up. i m focusing on 3 things : coding problems - got good amount (200+) of easy/medium/hard leetcodes system design - reading db, cache, cloud concepts, ctci and educative system design questions, etc behavioral - prepping leadership principles, tell me about a time blah.. questions do u guys think anything else i shall be focusing on as well. such as may be like microservice arch nitty gritty details, or knowledge cassandra, dynamodb, hdfs, kafka streams design or even hands on how to integrate them in code, os concepts - multithreading,.. or even something else? thanks in advance!