Looking for Founders Struggling with Customer Onboarding

A lot of founders obsess over getting new customers.
But what happens during the first 7 days after someone signs up?
That's often where growth is won or lost.
I've seen great products lose users simply because:
• Customers didn't know what to do next
• The setup process was confusing
• Nobody checked in after signup
• The first win took too long to achieve

The best onboarding systems remove uncertainty and guide users toward an early success.
Founders:
What's your current onboarding process?
Do you have one, or are you still building it?
I'd love to hear what's working and what challenges you're facing.