I would suggest working on cutting the soda out since you can't have carbonated drinks after your surgery for a few months (though my surgeon said it's not wise to ever drink it again as it'll re-stretch your stomach, which leads to weight re-gain). My surgeon didn't require me to lose any weight before my surgery but I lost 64 pounds in the 8 months leading up to my surgery (21 in the first 3 months). I did an elimination diet thing since I had to wait a minimum of 6 months before they could even seek approval for a surgery date because I wanted to prepare myself for how I would be eating for the rest of my life. I don't want to get back into bad habits. I never want to get back to being almost 400 pounds (at my heaviest I was 389 pounds). I cut back on my portion sizes with no seconds. Of course cut out fast food (other than salads). I cut out soda, then rice, pasta, bread, potatoes, and beans in that order. And then just maintained.
Cauliflower rice is a good rice replacement and G Hughes makes a sugar free terriyaki sauce that makes for good stir fry (also makes an awesome bbq sauce which is also sugar free and great for chicken). Cauliflower pizza is surprisingly good and really the only difference I notice is that it doesn't crisp like bread. Whisps are a brand of cheese crisps they sell at Walmart which make for good croutons or chips and are low carb and delicious (Asiago and pepper jack cheese ones are my person faves followed by parm and then cheddar, though the cheddar are best dipped in salsa). And if ice cream is hard to give up they sell a low carb brand called CarbSmart which is made by Breyers. I also had 1/4 cup of peanuts 2-3x a week for snack.
These are just what I did. Everyone's bodies work differently so I don't know what will work for you. I wish you the best though!