Turns out, after switching back to X11 I can suspend my laptop without any issue.
I never realize that I am on Wayland. Because right after NVIDIA installation, the Wayland button for login is disabled. Maybe after some update (because I update my machine daily) I can log in with Wayland without my consent. Thus crippling the suspension process.
Now I am wondering what If I switch to X11 without installing xorg-x11-drv-nvidia-power is the suspend issue will be gone? I don’t have time to try this. At least now I can suspend my laptop.
Note: I realize that I am on Wayland after I want to use an automatic time tracker such ActivityWatch. Most of them don’t work. Turns out I am on Wayland.