Getting references after a company closes, hotel front-desk agent here

The company closed and I am not sure how to reach former colleagues. I have been trying to stay organised about it. I have one former client who liked my work. Who did you use?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.

A client reference worked well for me. It shows you deliver outside the company too.