Imo, Java is not great, not a little. Java is actually the very "shit that we had before Kotlin", because initially there was Java and something for enterprise in like far XX, and then it was just cheaper for enterprise. Let's be honest,the way how java does operate on the memory and other things is terrible. The world was just waiting for the age of finally good languages which a lot of people work on and it's a pleasure to use them.

I disagree. Kotlin will boil down to equivalent bytecode as Java so Kotlin will not magically solve any memory problems you perceive Java has. At the end of the day, it still uses a JVM which will be have to be performance tuned in exactly the same way as if it was coded in Java. If you're coding in other JVM languages such as Scala or Clojure you'd still have to do the same thing.