Remediating accessibility issues does not always mean editing a document. To save time and resources, prioritize your efforts using the following strategy, ranging from elimination to direct editing:
Remove
Does the document need to exist online any longer? Older documents can be deleted or kept on department servers (Sharepoint) instead of public websites.
Archive
Is the document older and/or not being used any longer? Documents that need to be publicly accessible can remain so, as long as they meet the criteria outlined on the Archived Content Definition page.
Recreate/Re-export
Often, it is easiest to edit a working file (Word, Excel, Powerpoint etc) and re-export as a PDF. Recreating a document from scratch with accessibility in mind is often easier than fixing a document that has issues.
Convert (to html)
Should the document actually be a webpage? Simple webpages are much easier to make compliant than PDF documents.
Remediate
If all other options are not possible, a document can be remediated with tools like Adobe Acrobat.