Swap to a 0 calorie version and just keep enjoying it? Fizzy drinks are a pretty harmless vice in the grand scheme of things. Hollow calories, so if you can replace it with a 0 calorie version, it would at least stop affecting your weight.
I know everyone is against artificial sweeteners. They won't kill you faster than microplastics, pollution, break pad dust, war, alcohol, smoking,...
Enjoy life! Enjoy a fizzy drink! I thoroughly enjoy my daily coke zero can.
From my 12y old kids perspective:
The switch 2 plays fortnite and Mario kart. The steamdeck doesn't.
There is no difficult choice for him.
He doesn't give a fuck about anything else. Neither do his friends.