Check ArchLinux.org for news before you kick off an update. It’s got an RSS feed and a mailing list if that helps.
Read the Wiki, and turn to it first for any issues you have.
This one may be a special “me” problem, but if you’re manually interacting with wpa_supplicant, stop and go read the Networking page in the Wiki again.
Learn how to use journalctl (at least superficially) before something goes wrong.
Generally you want to restart after an update to the kernel or graphics drivers or things start degrading strangely.
What was your experience with Inkscape and Godot? I have those both installed from repo.
I’ve never felt the need to use flatpak at all on arch.