As an alternative, you could pick up “Algorithms Illuminated” by Tim Roughgarden. Get the Part 1 book, read it casually a few times to get a sense of what’s in there, then go back to the beginning and start slogging through the exercises. Don’t hesitate to look for stuff on Google and YouTube when you’re stuck, but keep reviewing as much as necessary until you’ve legit learned the material.

This is the approach I’m taking. Too soon to say if it’s working out yet. I’m thinking long term rather than getting a job offer at X company in Y months. There might be other books that work better for you than the one I recommended. I’m also in my 30s and have a job I’m more or less satisfied with currently.