Learn both. Spring boot takes more time to learn, because you need to understand spring core first, then spring MVC, then build tools like maven, pom (to truly master spring boot application deployment) One specific technology is never going to land you a job. Go for the whole stack. Example, organizations that use spring boot, won't just look for candidates with spring boot. They might ask for docker, Kubernetes, JavaScript, some ui framework like angular/react, maven, git, etc. Learning curve for python django is easy and small. Focus one technology at a time. Learn it in a couple of weeks. Then go on to another technology in the stack. If you master multiple stacks say java stack, data science stack, web development stack then you should not be short of opportunities. More opportunities means more bargaining power. Having said that, don't run behind money. Money is necessary to sustain but it is not worth pursuing. Pursue moral values, or at least technical excellence. And money will follow wherever you go.

My mantra is not sticking to a particular technology. That is what I'd suggest. Going by that, I recommend you learn both, Django and Spring Boot. But if you want to choose one among the two, I'd say stick with Django. Saves you the effort of learning a new language and a new framework. Rather, you can spend that time honing your Django skills. It is a wrong notion among young graduates that organizations decide pay based on your technology stack. You just need to be good at a technology that is in demand. You'd be paid well no matter the technology. Django is a wonderful framework and there are tons of companies looking for Django experts. The same can be said about Spring Boot. Both are wonderful technologies in their own accord. As for you, just go with the technology you are already familiar with. It is a misconception that Spring Boot developers get paid better than Django developers.