Hi Andrew
Normally closed captions should be on all videos. I’m not sure if descriptive audio for the blind is required or optional.
I suggest joining some Facebook groups like Adobe Premiere Pro Editors. I’m on there, you can mention me to admin Kyle.
I can’t think of anything else you could add to videos other than those two. I do captions and subtitles independently and for a translation company. It’s a bit technical and specific.
Also do a deep Google search for ADA or FCC compliance and see what you get.
Sometimes you can get cost rebates for adding captions, but you’ll need to find out how to apply.
Bret