Remove the connector from PCB and solder mid to mid shield to any side of it. I'm using many in this way

Show some schematics please

Do you need to update the whole code or just some variables?

Gpio0 usually a strapping pin don't use it try another one.
If you need accuracy you can use ads1115 for adc reading which will not be effected by voltage.
Or, you can use Battery 18650 Stats library to read it more accurately.

Ya da hocam 5vtan düş en temizi

Which model do you use?

Use flyback diode on the input side of the buck converter. Another one on outputs. You are switching an inductive load which makes HUGE spikes on the power rails. The reason is why you fried esp overvoltage spikes.the reason why its random is spikes are sometimes suppressed by diode but if the first...

You cant do it with gpio but can make by scraping the solder mask on the esp module itself. Google " add external antenna to esp32" and you will see bunch of examples

Gpio14 is adc2 i guess and also strapping pin. Use one of these
ADC1_CH0 (GPIO 36)
ADC1_CH1 (GPIO 37)
ADC1_CH2 (GPIO 38)
ADC1_CH3 (GPIO 39)
ADC1_CH4 (GPIO 32)
ADC1_CH5 (GPIO 33)
ADC1_CH6 (GPIO 34)
ADC1_CH7 (GPIO 35)

May be it's not the best way to do it but you use it like,
Wire.begin()// as default i2c
Wire1.begin(anypin,anypin) // as any other pin as second i2c

I'm using both ht7333 and ht7833 for years without any problem. But the important thing is how much current you need? İf im using for espnow or any other task i go with ht7333 (without wifi and ble) İf im using only one radio im using ht7833 with HUGe capacitors on the power lines ( at least 680uF ...