In short, if you have w3schools on your cv as one of your primary sources of web tech education, I'm using your cv as a firestarter.
MDN would be better reference material, and consider paying for a short course, somewhere, anywhere.
After you've completed said shortcourse, pick a topic, any topic, and build a single page app for it. Repeat 2 more times. And then build a 1 page portfolio.
Extra points for using React, Vue and jQuery / pure javascript es6 (yes legacy code matters).
Welcome to the world of frontend dev. And good luck.
PS.Get ready to put in 12+ hour days, for a long long time. I worked 4 years straight, no breaks, no December holidays, for minimum pay, while paying off my student debt. All of that just to skill up enough to finally be called a mid-level frontend dev.