Build an application. Even if it's terrible (and it likely will, since you are still learning), you will have learned all those skills that you say you need.

Build an application. Even if it's terrible (and it likely will, since you are still learning), you will have learned all those skills that you say you need. You need to develop your skills in building applications, and the only way to do it is by building applications. You also need proof of your newly acquired skills, and actual code is the best way to do it (even if you have great credentials). Actually, don't build an application. Build several.