[Request] I'm an idiot and forgot how to acheive this effect

So I'm trying to make graphics with this style







and I've already saved the .psd file from when I was making the first file but I must have merged an extra layer before I was able to transfer to the new one, and now I'm stuck with this







I've already tried adding a multiply layer and dark blue exclusion layer, but I just can't get the same colouring. :"(
Help would be greatly appreciated.