Yes, I think time has helped, my thought is healing in the gut is not quick due to all of the food that passes through it daily. I have read that collagen is healing so I have added jello to my diet, I make it from gelatin powder, lemon juice, and monk's fruit (as a sweetener). I sprinkle 1/4 cup of frozen blueberries (FODMAP safe portion) over my 1 cup serving of jello and it is a welcome treat.

Have you looked at Norm Robillard's fast track diet?
https://www.fasttractdiet.com
https://digestivehealthinstitute.org/fast-tract-diet/
He is a microbiologist who had acid reflux, went on a low carb diet to loose weight, and his symptoms disappeared. He has discovered that high fiber foods digest too slowly and allow bacteria to thrive and multiply. While the bacteria are busy digesting the fiber they cause gas. He has written a couple of books that explain the diet.
Some foods that are FODMAP safe are too high in fiber/carbs for my gut. An example is Quinoa whole grain, on the FODMAP app 1 cup of cooked Quinoa is safe, on the Fast Trac App 1 cup of cooked Quinoa has a fermentation potential (FP) of 56. I think I don't tolerate over 50 FP in a whole day, so quinoa is out. I have also found that I might be able to eat a small portion of a high fiber food, but not every day.
So I guess I recommend you get the Fast Track Diet book and then the app if you are willing to try it. You will need to keep a food diary to keep track of your portions and FP points. I had to combine the Fast Track Diet with the FODMAP diet as I am sensitive to Fructose and Fructans.
Any time you have gut surgery it increases your risk of developing food sensitivities.
Our library had a copy of his book:
https://digestivehealthinstitute.org/shop/
One thing that really helped my gut was when I was able to add potatoes, shell beans, and a probiotic. I eat a lot of salad and add in veggies/beans in portions that I digest well. It seems like I am tolerating more fiber than I use to but do not expect to ever get back to pre-surgery efficiency.
It took years to find a probiotic that helped me. I really like SFI Ther-biotic Synbiotic, it is a FODMAP safe probiotic. I purchased a different brand that had FOS fiber and it gave me gas. So watch out for additives in your supplements!
I also like Healthy Origins Natural Probiotic, 30 billion CFUs.
I have attached a list of additives that have been found to cause some people digestive upset. The list is from Dr. Alison Siebecker, an expert in the SIBO field. Who knows, you could be taking a supplement that is causing problems for you. I find magnesium oxide causes a lot of gas and loose stool so you might want to watch out for it too!
Put on your detective hat and get going! The digestive process is so complicated it sometimes takes a bit of work to find the key to good digestion. Good luck and hang in there!!