I had an infection and was prescribed antibiotics, and needed to pause the esomeprazole. I asked gemini about it and it suggested I take two probiotics while on the antibiotics, Saccharomyces boulardii and Lactobacillus rhamnosus GG. I noticed after a few days that I wasn't getting heartburn, and started putting the pieces together.
After the antibiotics ended, with still no heartburn, it recommend I add rhamnosus gg to the mix. So now I take all three daily and rarely get heartburn. It's been quiet a shock
Foods to eat, oatmeal, lentils.
Ginger tea, activated charcoal tabs.
Most all of that works very well to support gut bacteria so throwing some probiotics in as well can help. The gummy kind available in generic or Digestive Advantage work well!
I even once read that someone noticed an issue they tried to clear up for years with doctors went away on day 3 of a water fast. No, he wasn't going to fast forever. But he was shocked the first relief he ever had was that day. From there he solved his problem once his eyes were opened a bit.
I'd personally try all ground beef for a week or two. It won't kill you. Is it ideal? Probably not. But you will not have any problems from that short trial. Then add things slowly until you have a whole good diet you like.
Look into low-FODMAP diets if you haven't already.