- Slack used to (they still might I just haven't created a new workspace in a while) have Slackbot message you to setup your profile so that you're literally using the software as part of onboarding.
- Aircall has you get a phone number and place a call directly from your browser, then use your phone to call that number back and have it ring in your browser.
Focus on the the path to that magic moment first, ensuring that users who do sign up have an incredible onboarding experience and understand the value.
Otherwise, you're just pouring water into a leaky funnel, and you might end up even worse off. You'll spend the same amount of time and money on support for your leads, but few of them will ever convert to dollars.