Can anyone please advice me on how to enhance my java skills? Practice, projects or anything...

work on open source projects is a nice way to improve your skills ☺☺

Depends on how advanced you are, you can always look for video courses. After you have the basics figured out, start a small project with some level of complexity, then just learn on the go, look for tutorials on how to do certain things. Just gotta be careful on the good practices, it is easy forget about them when developing solo. Also, you should read and research about what people are using for Java nowadays, like spring, hibernate, jstl, had, etc

Android apps are kinda fun to program. .

coffee... :D