I'm in my final year of college and have finished a JavaScript course. I can explain concepts, but I freeze when I try to build a more involved project on my own, especially when classes or this come up.
Should I start another course, review the basics, or focus on building things? I'm also hoping to find a job within the next year.
Pause the videos for a bit and build something small without following along. Pick one feature, write down what it needs to do, and get a rough version working before adding anything else.
When you get stuck, try to narrow the problem down. Is it the data you need, the event that starts the action, or the code that changes the page? Look up that specific piece, then return to your project. Debugging and figuring out what to try next are skills you need to practice too.
I wouldn't buy another course yet. There are plenty of free options, including The Odin Project, freeCodeCamp, JavaScript.info, and MDN. Use a structured course if you want exercises and a path, or MDN when you need to check how a particular feature works.
Exercism is another option if you want focused coding exercises. Whatever you choose, spend more time writing and testing code than collecting resources.
For classes and this, go smaller than a full project. Make a tiny example with one object, one method, and a console log. Change how the method is called and inspect what this refers to. Once that makes sense, try using the idea in a small feature.
You don't have to restart all of JavaScript just because a couple of topics feel shaky. Review the bits that block you, then put them to use.
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spare.square.bracket:
Keeping the first version tiny helps. You can always add features after the basic interaction works.