[emadehsan]

Ask for their feedback. In the meantime, treat the variables for your rejection as "Unknown unknowns". You don't even know what you don't know.

To find out, work on an interesting project. Build something that involves the whole tech stack you are targeting. You will actually find a lot of gaps in your knowledge. The idea should be something that you care about... that will keep you interested in seeing the final outcome if it is a large project.

You have to showcase your ability to work on large sophisticated projects and the confidence that you can get them done.

"Be So Good They Can't Ignore You".