Well first of all I think you have made good progress with the little reduction in your screen time.
But is it really progress when you have a substitute which is still screen time? I think the substitute for the snapchat addiction should be something which doesn't have to do with screen time. And I also think that the cure for your snap addiction is not by deleting the app. You should make an intentional decision not to visit snap frequently and only go there when you need to.
I used to be really addicted to tiktok and I thought deleting it will help, but then it was only a temporary solution as I kept on reinstalling it after a few days.
So I made an intentional decision not to watch it as much as I do and now I even get tired after watching 2 or 3 videos. It didn't happen over night.
I hope it gets better though.