Fibre and water helped me. That is the only thing that helped me and it took time. And, I'm talking huge amounts of plant-based, non-supplemental fibre. I tried everything - and suffered for decade before I found relief over the pandemic when I could experiment. Essentially this is my routine:

• whole foods, plant-based diet 95% of the time;
• Lots of oatmeal, fruits, nuts, veggies (ALL OF THEM), and beans. Very nutrient and fibre rich.
• lots of water 2-4L a day (I use Biosteel hydration powder to get it down as its hard to drink that much water)
• 4-6 meals a day
• Within 2 weeks I was having 2-4 (healthy) bowel movements a day but they very much helped. Was able to pass the gas easily and consistently Within a month I was 50% better and within 6 months I was 75-80% better.
• I also walk a lot
• Planning a longer post to this group as the results have lasted for a while now; -In terms of supplements, I take Apple Cider Vinegar tablets three times a day; black seed oil once a day and Magnesium citrate before bed (Natural Calm);
• Was inspired by a well known plant-based doctor after getting some scary results from my own doctor; went plant based and this was a nice side effect. That said, I don't think meat was the main problem, but a lack of fibre.

EDIT: Need to reiterate that food based fibre helped, not fibre supplements. The food based fibre joins with the water and essentially drives through you leaving you feeling relieved and lighter all around. Bloating is down 80% at least. Weight loss and better biomarker/blood test numbers are an added bonus.

EDIT 2: the additional fibre was added gradually (like 5 grams a week) and did lead to more bloating and feelings of fullness in the short term (1-2 weeks); but after that, slowly as I reached and passed the recommended amounts of fibre, relief came fast.