Issue flashing Marlin 2.0 to Ender 3 (Creality Board 1.1.4)

Projects Programming
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Tons of errors, trying everything but no luck. Compiling takes 10 minutes at a time so it's been a slow and frustrating process. I've managed to get it to compile without errors once but gave

avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
An error occurred while uploading the sketch

errors when uploading it to the board (this was with the 'Arduino Mega or Mega 2560' board selected). The light was not flashing on the board when it was trying to upload.

I've also been trying to use MightyCore as a work around since Sanguino isn't an option. Unfortunately I get a

#error "Oops! Select 'Arduino/Genuino Mega or Mega 2560' in 'Tools > Board.'"

error when doing that most of the time, along with 300 other lengthy errors. I'm running out of ideas. I'll attach the configuration.h and configuration_adv.h files I'm working with and I'm using version 1.8.12 of Arduino.

I've been following https://all3dp.com/2/ender-3-with-marlin-how-to-install-marlin-firmware-on-your-ender-3/ which has obviously only gotten me so far.

Any help would be amazing and there's more info I need to provide, just let me know.

Configuration.h (82.8 KB)

Configuration_adv.h (126 KB)

Version.h (2.47 KB)

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The issue was with the Arduino IDE as far as I could tell, which is why I was asking in the Arduino Forum. But either way, I appreciate the response.