I have run out of ideas, so all I can suggest is check all pins defined in your sketch, against the image of the board pinout you provided.

Also the hard way to troubleshoot is to comment out the LoRa stuff until it compiles and then slowly add features until it crashes. (Gonna be a long night)

oof. I just thought...what 'ESP32 by Espressif' board def are you using? The newer ones break LilyGO products. Try v2.0.15

Like that:

However, with the code on this site: https://randomnerdtutorials.com/ttgo-lora32-sx1276-arduino-ide/, the card restarts all the time. Just like with my code.

One the serial monitor:

21:18:44.867 -> rst:0x8 (TG1WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
21:18:44.900 -> configsip: 188777542, SPIWP:0xee
21:18:44.900 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
21:18:44.900 -> mode:DIO, clock div:1
21:18:44.900 -> load:0x3fff0030,len:1288
21:18:44.900 -> load:0x40078000,len:13872
21:18:44.900 -> load:0x40080400,len:4
21:18:44.900 -> ho 8 tail 4 room 4
21:18:44.900 -> load:0x40080404,len:3048
21:18:44.900 -> entry 0x40080590
21:18:45.942 -> ets Jun  8 2016 00:22:57

Put the board into upload mode by:

1. Hold Boot button, press and release reset button
   or
2. Unplug USB hold down the Boot button, plug in USB and release Boot

In the Tools menu select

Erase All Flash Before Sketch Upload: "Enabled"
to clear out the bad sketch.

If the USB shows connected, upload this basic generic Serial Monitor sketch for testing.

//words preceded by "//"" are comments and are not executed
bool ticktock;  //declare ticktock as a boolean flag

void setup() {           //runs once on start up
  Serial.begin(115200);  //open the serial port for USB cable
  delay(500);
}

void loop() {            //runs in circles!
  ticktock = !ticktock;  //every pass through reverse the flag
  if (ticktock) {        //test current value of the ticktock flag
    Serial.println("tick");
  } else {  //prints one or the other to the USB port
    Serial.println("tock");
  }
  delay(1000);  //wait for a second and run again!
}

To re-start the test sketch unplug the USB and plug back in.
Try this!
-Terry