> If the job is the source of unhappiness, staying in the job will perpetuate the problem.

There's a bit of a leap here -- you're made unhappy by your job, but it's harder to say how much of the cause is the job vs. you. The relevant question is really just whether taking your current mind and putting it in a different job will make everything better, or if the issue is, at least partially, how you're relating to your job.

I say this as someone who's had a string of jobs where I'm unhappy for ~similar reasons. Each was a bit different, but the consistent undertone of unhappiness makes me think that it might be higher leverage for me to examine my relationship with my job instead of just hoping over and over again. I suspect there's ways of thinking about my job that I'm "carrying" with me, and addressing those things will do more for my happiness.

Changing jobs is (likely) necessary but not sufficient. For example, if OP works a front-end job at Meta and switches to a front-end job at Google, that's unlikely to make them motivated. I don't think you're "missing the point", but I do feel that your answer is very incomplete.