I was blessed to be in a position where I was able to spend nearly the entirety of my quarantine free time practicing Leetcode. Last week I signed an offer with an American FAANG level company and more than doubled my final TC. I realize this is a highly anecdotal, unusual scenario, but the possibility is there. Note that part of this was due to the weak $CAD, but regardless, the level of potential TC gains going from small startup or dev shop to FAANG level truly cannot be understated.
If you're interested in joining the rat race, Blind is a pretty good place to start.