Way more people wanting to work, than work. The former librarian at my firm wanted to volunteer at the NGA library when she retired. Librarian. Archival experience.

She basically had to get in line after 18 other people with similar or better experience, to work for free for a few hours every other week.

Dumbarton Oaks needs a Byzantine specialist; the Museum of Women in the Arts needs a remote curator for a lot of money and no benefits. There will probably be 50 applicants for each position.

Check the universities, too. Some of them may have museum collections.