Who do I ask for a reference after a layoff? after 15 years as an accountant

I worry a reference will only confirm dates of employment. This is my first time dealing with any of this. HR only confirms titles and dates. How do you ask politely?

Use a professional network to find a former manager. Many will still write a note.

Ask former colleagues and supervisors in a short message and give them a summary of the job you are applying for.