Which short course helped you get hired? after 10 years as a machine operator

I am considering a short certificate to improve my chances as a machine operator. Thank you in advance. I am unsure whether employers value it. Which ones are overrated?

A hands-on course with a project helped more than a purely online one.

Thanks for writing this out. I went through something close to it 13 months ago, and it settled down once I kept a simple log of every call and form.