Don't "growth hack" your sign up, just remove it completely if at all possible, or push it as late as possible in the process (after the user has engaged with the product).

This is one of the lessons of TikTok.

Virtually every SV startup asks you to sign up now, provide a ton of information about yourself, and then spam you relentlessly with marketing email.

Part of TikTok's genius is that you just open up the app and you're immediately interacting with the content.