Ask HN: How do I figure out what skills are in demand?

I've been looking for a new software engineering role for a couple of months now. Despite have 3 years of profession experience, I'm having no luck getting calls. My best plan at the moment is to work on my skill set, get a few certifications, and create an impressive project or two to showcase my new skills.

Are there any sources on skills that are in high demand today? Are there any certifications that would look great on a resume?

Bonus question: Is the market over saturated at the moment? It was so much easier to find a job two years ago.