No CiviCRM Menus on WordPress
I would try clearing caches (click Cleanup Caches and Update Paths on the admin menu).  I would also check your Resource URL to make sure it's correct (click Resource URLs on the admin menu).

I would also try using one of the built-in themes (e.g. "twentynineteen") to rule out a badly-behaving theme.

Finally, I would try bringing up your browser's Developer Tools (press "F12"), heading to the Network tab, and reloading the page.  If you see any 404, 403, 500 errors - really, anything besides a 200 - please update your question with those details.  Also note that you'll want to do a hard refresh of the page in between the first two steps - that's Ctrl-Shift-R on Windows/Linux, and Cmd-Shift-R on a Mac.

UPDATE: Looking at the request URL in your screenshot, that looks pretty squirelly.  I very much doubt thaat's the correct URL.  That says to me that there's probably something wrong with your Resource URL.  Is it possible that you're using a symlink ("alias") in your file path?  If so, try to fix any paths defined either in Administer » System Settings » Directories or in civicrm.settings.php to use the equivalent non-symlinked path.