Welcome to the forums Andrewsarchus. Thanks for giving EndeavourOS a try.
Try
$ sudo nvidia-installer-dkms -t
I believe the dkms version of nvidia-installer is the only version installed out of the box. With nvidia-installer you have to take action on the Nvidia drivers with every new kernel. The dkms version handles that for you.
EDIT:
Also, which Desktop Environment are you using?
@Andrewsarchus
A tip: you can use the Tab key to complete the (partial) command while writing.
For example, write
nvidia-ins
and then hit the Tab key, possibly more than once.
As @joekamprad mentioned, we must update the wiki page. The nvidia-installer-dkms is mentioned there, but it should be more clearly stated that it is the default tool.