You only had to run, the commands i mentioned, just once …
AFAIK you don’t need synaptics, and that’s not the code i said to use for the 30-touchpad.conf file.
Section "InputClass" Identifier "touchpad" Driver "libinput" MatchIsTouchpad "on" Option "Tapping" "on" Option "TappingButtonMap" "lmr" EndSection
If you follow the discussion on the post i linked previously, you will see that i asked to see if the /etc/X11/xorg.conf.d/10-edev.conf exists and how to deal with it, what needs edited, and why we created the 11-evdev.conf instead, and should only have this code:
Section "InputClass" Identifier "evdev pointer catchall" MatchIsPointer "on" MatchDevicePath "/dev/input/event*" Driver "evdev" EndSection
When you edit them, pay attention to have it opened just once, save once is modified and then close the file.
If the above doesn’t help after you check them and reboot, let me see the output of:
for i in /etc/X11/xorg.conf.d/*; do printf "$i:\n%s\n" "$(<$i)"; done
it seems you might have another conf there that prevents the touchpad to work.