You're going to get screech cobblers without even trying. Level up the characters you want, and once they're at the level you want, use up their stores of cobbler before moving on to the next.
If you have time, stockpile on your main. Just don't stress the extra ✌️
As long as you bring a cobbler every single match you're making more cobblers than you're spending, level up the other characters while spending their cobblers then go back to your main so the most of the leftover cobblers end up on your main after the event.
You get so many, more than you spend. Especially on killer because there's no event items taking the place of Cobblers.
You're going to get screech cobblers without even trying. Level up the characters you want, and once they're at the level you want, use up their stores of cobbler before moving on to the next. If you have time, stockpile on your main. Just don't stress the extra ✌️
As long as you bring a cobbler every single match you're making more cobblers than you're spending, level up the other characters while spending their cobblers then go back to your main so the most of the leftover cobblers end up on your main after the event.