LED blinking using Timer without delay function

Question

I am writing a simple program that has to blink LEDs with frequency 1Hz using Timer0 and Timer1 without using delay() function.

The program gets complicated, but it doesn't blink. What can I do to make it work?

Below are additional details:
Michrochip studio
F_CPU 16000000UL
Timer0 set on 256.
Timer 1 starts counting from 3036.
The LED is connected to the PB1 PIN.\

#include <avr/io.h>
#include <avr/interrupt.h>

void initTimer0() {
    TCCR0B |= (1 << CS02);
    TIMSK |= (1 << TOIE0);
}

void initTimer1() {
    TCNT1 = 3036;
    TIMSK |= (1 << TOIE1);
}

ISR(TIMER0_OVF_vect) {
    PORTB ^= (1 << DDRB);
}

ISR(TIMER1_OVF_vect) {
    TCNT1 = 3036;
}

int main(void) {
    //DDRB |= (1 << DDB1);

    initTimer0();
    initTimer1();

    sei();

    while (1) {
        if (TCNT1 >= 65536) {
            DDB1 = ~DDB1;
            TCNT1 = 3036;
        }
    }

    return 0;
}