Pausing Blynk re-connecting to handle button press event

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You don’t need a full-fledge Debouncing library as it might be not written to use in ISR.
You can just use some simple debouncing way using millis() inside ISR. For example

#define DEBOUNCE_TIME                   200     // the debounce time in msec; increase if the output flickers

volatile unsigned long lastDebounceTime = 0;
volatile bool currentState = LOW;

void ICACHE_RAM_ATTR Falling()
{
  unsigned long currentTime  = millis();
         
  if (currentTime > lastDebounceTime + DEBOUNCE_TIME)
  {
    lastDebounceTime = currentTime;        
    
    //Reverse the state
    currentState = !currentState;
    
    // Do something, such as turn ON/OFF lightPin
    digitalWrite(lightPin, currentState);                                         
  }        
}

void setup()
{
  ....
  pinMode(buttonPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(buttonPin), Falling, FALLING);
  ....
}

The ISR will work no matter you’re blocked by something, such as blocking Blynk.begin(). But as @PeteKnight suggests, you’d better use Blynk.config() and Blynk.connect() to avoid being blocked if you have something important to do in your loop().
The timeout period of Blynk.connect() can be specified either in the call, such as Blynk.connect(TIMEOUT_IN_MS) or by using the following #define. Just place it before first #include of any Blynk library (better the first line of your main code).

#define BLYNK_TIMEOUT_MS     WANTED_TIMEOUT_DIV_3_MS

If Blynk.connect() is called without argument, the timeout will default to 3 times of BLYNK_TIMEOUT_MS (currently 3s or 6s, depending on which device you’re using) as specified in Blynk/BlynkProtocol.h and Blynk/BlynkConfig.h

bool connect(uint32_t timeout = BLYNK_TIMEOUT_MS*3);

You can also try this

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