Don’t know if this will help but i’ve been in the tech industry for 4+ years and here is what I currently do.
I follow all the well known blogs in front-end development and create a lot of personal projects.
To learn CSS, i’ve been advised the best way is to “copycat” a website and by experience you become a lot better. I’m currently looking into CSS Grid and Flexbox at the moment, it’s quite exciting the possibilities.
Another good option is to attend conferences or meetups if there are any in your area to see what others are currently working on.
Hope this helps,