Just an update that I was provided fantastic support and my situation got resolved - I was able to retrieve my notes. Thank you, Evernote team!
EDIT: I can't reply to posts for 24 hours or reply to stuff in my inbox (5 msgs a day so maxxed out) so sharing for everyone - I'm a Windows user. What sorted out my issue was installing the legacy version (link below), which indeed had all my old stuff (whew), then re-open the new one (I could have both open), I watched it magically sync, then I made sure that any local Notes were then migrated over. I hope this works for you all. I'm optimistic it'll get fixed for everyone who had a similar issue.
Lost notes in update
in Evernote for Windows Issues (Versions 10.0 and above)
Posted
OMG! It worked! Thank you so much ❤️