Several replies also mention options trading, such as this from @JessTheUnstill, as a way to manage your bet against Tesla more closely:
https://infosec.exchange/@JessTheUnstill/114196064404618244
AFAICT, this is a great thing if you have time and mental energy to devote for this and are a glutton for learning and micromanagement. Like…if you’re the sort of person who regularly tries out new Linux distros just for the hell of it, this might be for you!
If (like me) you want to go through the setup process once and then let the money do the work for you, the inverse ETFs seem like the way to go.