I drink at least 1 liter of coke a day and 2 monsters in the morning
I eat goyslop everyday because I cba to cook own food
I smoke 1 pack of cigs a day
I use melatonin which probably reduces sleep quality
At least I quit drinking
I've lead a similar life OP and it's hard to quit. After some thoughts from my own experiences I'd recommend this.
First, it's great that you quit alcohol. Seriously that shit is a bitch. If you can quit drinking you're on the right track tbh.
Second, quit smoking next, going cold turkey isn't too rough it's nothing like alcohol addiction. Quitting alcohol is a bitch it constantly hounds you. Quitting nicotine you'll get a bit of an itch here and there for about 2-3 days but it'll pass.
Third, uh, I've never takin melatonin but I think just stop taking it. The problem with these nu-tropics is that once you take them, they end up throwing your whole system out of whack. It's an artificial hormone, or compound, that ends up compromising your natural system. I think after some time of quitting your system will return to its rhythm.
Fourth, goyslop. Man I know it sounds cliche. But I think dry pastas and meat might be the best step for your diet. Add some rice and plenty of veggies. Now the reason why I say this is you just need a bit of water, not much spice, and just some heat. Take a few minutes and boom you got a decent deal with calories and protein.
The thing is I lived off Ramen and chips for a long time and it sucks ultra hard. It makes you feel like shit.
Unfortunately, I can't speak much on sugars and soda.
I wish you well OP.