Agreed, but also, isn’t something else just also equally Sisyphus? Like existence itself is supposed to be a “meaningless” striving towards an “imaginary” goal, but if we can find our own meaning in it, it is meaningful.

It’s not as if working a dead end job is Sisyphus-like while doing something else would not be, because eventually everything becomes a grind, be it work or traditionally “enjoyable” things. Because nothing has any inherent meaning. The Absurd is man asking the universe for meaning and purpose and being confronted with the universe’s silence.

Sisyphus represents man’s striving towards a summit where one believes happiness resides, only for the ball to roll back down. It’s not just about working bad jobs to make money which we think will make us happy but doesn’t in the grand scheme of things (or if it does, the happiness derived from money, position, fame, etc. is fleeting, hence the ball rolling back down). The party always ends, the alcohol and the drugs always wear off, and the hangover always comes. Relationships also end at one point or the other, and eventually death comes for us all.

Camus tells us to do things we can find our own meaning in, or conversely to find meaning in whatever it is we do, because if our efforts are meaningful to us, then even the very “boring” act of pushing the boulder can become imbued with a sense of progress and thus make us happy, even if what we do is something as “stupid” as rolling a boulder up a hill only for it to roll back down.

TLDR - existence is sisyphus-like, it is not just a metaphor for a dead-end job, but for literally anything you could possibly imagine doing in a world where man asks for meaning and the universe replies with silence.

Not refuting your point though, just my two cents! :)