When was the last time you performed maintenance? Here’s the link that I use as my general reference (and it comes from this darling community): A Complete Idiot's Guide To Endeavour OS Maintenance / Update / Upgrade
The commands it suggests are:
reflector --protocol https --verbose --latest 25 --sort rate --save /etc/pacman.d/mirrorlist
yay -Syyu
#optional additional steps
eos-rankmirrors --verbose #saves to /etc/pacman.d/endeavouros-mirrorlist
yay -Syyu