@shadowinthelight Start small would be my best advice.
If you try to change everything at once, then as soon as you fail at one part (it’s inevitable, we’re human and life happens), then you’ll give up the rest too.
I’d look for things to add in before you start taking things away.
For example - more movement (aim for 1000 steps each day. When this becomes a habit, increase it gradually).
More water. More fruit & vegetables.
And then if (or when) you feel ready, or once these things become proper habits, you can start removing things. Less processed food, less sugary drinks, etc.
Honestly small habits add up and make a huge difference! Aim to be 1% better everyday. You’ve got this