Assuming you are from India, I see a lot of news related to mass layoffs these days. My suggestion would be to hold on for a while till the situation stabilizes. You could use the time to do certifications.
If you know Core Java well, you'll pick up the others quickly. I recommend making a website that uses Spring MVC. It can be as simple as the "PetStore" app to show you can create REST APIs to expose your database operations. You don't to be at expert level to get hired. Medium level is fine too.