First, don't try and time the market. The market can stay irrational for longer than you can stay solvent.
Second, if you ignore the first point, please don't try and time the market with your rent money. It's only one step removed from gambling, and you wouldn't put your rent money on Red on the Roulette table, would you?
Third, if you ignore the first two points, please please please don't short anything unless you really know what the hell you are doing. It is like gambling with money you borrowed from the mob. It never ends well, no matter how much you think it will.
With all that said, I have two better suggestions:
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read about options trading, specifically about buying put options. It can be safer than shorting, if you don't fuck it up. I am specifically not writing more because you need to understand them yourself before playing in them.
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Why are you so pessimistic? Is it because of tech and AI slop? Simply direct your money to mutual funds that don't invest in tech. (There are S&P 500 funds that explicitly exclude the "Magnificent 7", and buy the other 493. Every year so far, the full S&P has outperformed it, by a lot. Do you feel lucky?)