Unable to blit a death screen within an if statement [duplicate]

Question

I've been experimenting with pygame trying to make a demo for a basic game, I'm trying to display a death screen when the player's health reaches zero. The program is definitely running the death screen subroutine however, it doesn't actually blit the image unless i take it out of the elif statement and put it in the main loop. I've tried looking for an answer but haven't been able to find anyone with the same problem. Any help is appreciated.

here is the main loop:

def main():
    clock = pygame.time.Clock()
    running = True
    alive = True
    while running:
        clock.tick(FPS)
        keys_pressed = pygame.key.get_pressed()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False
        if keys_pressed[pygame.K_ESCAPE]:
            running = False


        
        
        if alive == True:
            ########## MOVEMENT #################################
            player.player_movement()
            ######################################################

            if fireball.since_last < fireball.cooldown:
                fireball.attack()

            if fireball.since_last >= fireball.cooldown:
                fireball.x = boss.x
                fireball.attack()
                fireball.since_last = 0

            pygame.display.update()
            window.draw_window()
            player.draw_player()
            boss.draw_sprite()
            player.health_bar()

        
            if pygame.sprite.collide_mask(fireball, player):
                if player.health - 10 <= 0:
                    alive = False
                else:
                    fireball.on_hit()

        elif not alive:
            
            window.draw_death()

EDIT: Here is the window.draw_death() function

    def draw_death(self):
        DIED_IMG = pygame.image.load(os.path.join('Assets', ('died.png')))
        DIED = pygame.transform.scale(DIED_IMG, (1600, 800))
        
        screen.blit(DIED, (0, 0))
        print("Well then")

Answer 1

For completeness sake:

you forgot to update the screen after drawing the death screen:

elif not alive:
            
            window.draw_death()
            pygame.display.update()

while on the subject, you probably want to move the pygame.display.update() in your "alive" section to be in the end instead of the begining