Unfortunately that didn't work. I verified that the LCD is no longer lighting up with the raspberry pi connected to the printer unless I turn the printer on. Before covering the pin with tape, the LCD backlight would turn on even if the printer was powered off and unplugged.
Trying port /dev/ttyACM0, baudrate 250000
Handshake attempt #1 with timeout 10.0s
Send: N0 M110 N0125
Handshake attempt #2 with timeout 10.0s
Send: N0 M110 N0125
Handshake attempt #3 with timeout 10.0s
Send: N0 M110 N0*125
Creality's "this is a good cable" is VERY different than most devices (and humans) "this is a good cable". Cables which have the highest probability of working with Creality's printers are short, shielded, and have ferrite beads.
Creality Printers are very susceptible to EMI interference plus they are EMI generators, a potentially wicked combination. For example, see My Creality Ender3 runs into a lot of communication issues. You can search this forum for "Creality EMI" and find other topics that contain potential fixes.
Also, please enable the serial.log in OctoPrint Settings (bottom of the Serial Connection page). This will capture the communications between OctoPrint and the printer which may help us troubleshoot. This log is included in the systeminfo bundle.
After looking at your bundle it seems like the printer isn't responding at all. I'm wondering if the printer is even seen by the operating system. Please try the following and let us know.
Unplug the USB cable to the printer.
Login to the RPi via SSH (or a keyboard / monitor).
Type sudo dmesg --clear (enter the pi password when prompted).
Plug in the USB cable to the printer.
Type dmesg >dmesg.log.
Show us the (hopefully non-empty) contents of dmesg.log (use cat dmesg.log to look at it).
If the contents of dmesg.log is empty, then try another USB cable and keep trying cables until you see the printer being recognized by the operating system. OctoPrint can't connect to the printer if the operating system (OctoPi) can't see it.
[ 7841.884043] usb 1-1.3: new full-speed USB device number 7 using dwc_otg
[ 7842.018577] usb 1-1.3: New USB device found, idVendor=1d50, idProduct=614e, bcdDevice= 1.00
[ 7842.018617] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 7842.018637] usb 1-1.3: Product: stm32f103xe
[ 7842.018654] usb 1-1.3: Manufacturer: Klipper
[ 7842.018671] usb 1-1.3: SerialNumber: 35FFD10542543939-----------
[ 7842.020700] cdc_acm 1-1.3:1.0: ttyACM0: USB ACM device
The OctoKlipper plugin is not needed for a connection to OctoPrint at all, but you're on the right lines. OctoPrint can't communicate directly with the printer, it needs to communicate with the Klipper host that is installed on the Pi as well. Usually, Klipper then makes a serial port like /tmp/printer that OctoPrint connects to. See Installation - Klipper documentation for instructions.
The OctoKlipper plugin is an added bonus, but it is not the solution as you still need a working Klipper install & connection to OctoPrint first.