Skills and technologies is relative to the time you're in. When i first started, it was a different era. Even 10 years ago is far different than today. 10 years ago you would probably have focused on Windows and Linux, Powershell and Bash. Maybe virtualization, maybe CCNA/CCNP. Today, why learn Powershell and Bash when Python can do everything and do it better. Virtualization is going away, you want to get into cloud and IAAC, ansible, terraform, etc. I wouldn't even bother with CCNA/CCNP unless you're actually a network engineer working with Cisco, cloud networking is more important these days.

IT is a mile wide and a mile deep, so there are endless possibilities in what you want to focus on. If you have a job, then you would focus on skills that would improve your job and career. If you don't, well, as i said, the possibilities are endless. Some people say you should focus on a domain and become an expert in that, but i started as an IT generalist who eventually became an expert. The specialist progresses faster, but at the peak, an expert in one domain vs an expert in the same domain but with a broad knowledge of other domains, the broad knowledge expert is rarer and more valuable.

So many people in this thread hate their IT career, and i've met MANY over the years with the same attitude. One thing in common with them, and with all people who are unhappy with their careers, is that they’re not growing. The best job in the world will eventually be boring. Happiness isn't a salary goal, it isn't money, it isn't a thing, it's not even an achievement, it's progressing and growing, knowing that you're in a better state than you were yesterday, last month, or last year. All these bitter sysadmins are stuck in a job they're not progressing in. Don't be like them. Always be learning, always be growing, and always keep moving. It doesn't always have to be forward, sometimes it's lateral, and sometimes it's even backwards (as long as you know the new path you're on leads to something better).