The second striker needs a different pressing job.
If both forwards sprint at the same centre-back, one simple pass can remove them both.
I’d ask the first striker to affect the ball and the second to affect the next pass.
That might mean screening the other centre-back, getting close to the midfielder or positioning so the goalkeeper cannot easily switch play.
A build-up game with two forwards pressing a back three is ideal. Let the defenders move the ball and stop afterwards to ask what the second striker was protecting.
At U13, pressing is about controlling options, not having the most players near the ball.
If one striker is already creating pressure, the second can often help more by staying away from the action and closing the escape route.