At this point you may need to block out large sections of your code and start working with one piece at a time, adding in another as you confirm the first is working and so on.
One quick note… as per another topic, try adding in…
#define BLYNK_NO_BUILTIN // Disable built-in analog & digital pin operations
…to your code. If you do not use any direct pin reading or control in your App (and you shouldn’t if you are using virtual pins) then this will disable that internal function and may help with timing.