Suggestion required

Hi everyone, I am a working professional with 5yoe in total out of which 2.5 was in consulting and later 2.5 as Backend Engineer using Java. Recently my project ended and I am trying for other opportunities but I just realised that the work I was doing and the concepts we used in my recent project for Java was just core Java and I do not have the knowledge which is expected by employers in current market. All my colleagues are giving me a lot of topi