Low Power Arduino stuck sleeping

Using Arduino Programming Questions
#1

I wanted to try a low power sleeping feature by Rocketscream from his LowPower library. (here)
I uploaded my code without any interruption option (I know that was not smart).
Basically I can’t upload any new code to my Arduino Micro because it doesn’t allow a Serial connection as it’s sleeping all the time.
It’s only 1s of sleeping but it is run all the time again.
My question is whether I can interrupt this or if there is any possibilty of uploading new code to the board.
Any help appreciated!
Code:

#include <LowPower.h>

#define pinY 8
#define pinX 9

short valY;
short valX;

void setup() {
  pinMode(pinX, INPUT);
  pinMode(pinY, INPUT);
  
  Serial.begin(9600);
}

void loop() {
  valX = analogRead(pinX);
  valY = analogRead(pinY);
  
  byte shiftpos = shiftPosition();
  Serial.println(shiftpos);
  LowPower.powerDown(SLEEP_1S, ADC_OFF, BOD_OFF);
}

byte shiftPosition(){
  if(valY < 100){
    if(valX < 100){
      return 1;
    }
    else if(valX > 100 && valX < 900){
      return 3;
    }
    else{
      return 5;
    }
  }
  else if(valY > 900){
    if(valX < 100){
      return 2;
    }
    else if(valX > 100 && valX < 900){
      return 4;
    }
    else{
      return 6;
    }
  }
  else{
    return 0;
  }
}
#2