@ahmadchalhoub99
Well generally in the future you will get involved into projects that will require both skills. Surely Kotlin is better, with easier functions , null handling and more but you will always get into a situation where you will try to understand a block of code in Java that happens generally in the documentation. Also in the future you will like to contribute to a github library that probably it is going to be in Java. Android Studio has an easy way to insert Java code in Kotlin files by interpreting it and 99% of the cases it does a pretty good job.
So I believe that it is necessary to continue now with Java, have a good understanding of the language and when you feel ready switch to Kotlin… Try to get in touch once in a while with Java though in the future… Java will always be there in some projects and documentation.
Best