You might be able to get a job by taking courses and getting certified. However, practice is the best way to ensure your marketability.
1000 hours of practice is required for any skill. The same applies here. It is important to put your hands on and work hard to improve your technical skills.
The key is to learn the art of learning.
Courses I would recommend
- Programming in C
- The basics of electronics (everything starts here)
- Hardware design