My business grew too fast and my current supplier cannot keep up

A month ago this would have sounded like a good problem. Now I'm just stressed.

One of my product videos blew up and orders came in way faster than I planned for. My supplier is a small workshop, great for day to day volume, but completely overwhelmed right now. Lead times have doubled and customers are already asking questions I don't have good answers to.

I'm currently on Alibaba filtering for verified manufacturers that can actually handle larger order volumes consistently. Should have made this switch earlier but here we are.

On the funding side, I've been looking into different grants, and I actually just applied for the Alibaba CoCreate Pitch competition since they have a 1M USD prize pool for small businesses, but I'm also looking for other funding options if anyone has tips.

Has anyone gone through a supplier upgrade mid-growth? How did you handle the transition without losing customers?