Try a keto or even better a carnivore diet. It has been transformative for quite a few people. It doesn't work for all but it is a form of elimination diet, and at least for me, most plants cause me substantial gut & inflammation issues. There's a lot of dogma around "eat plants to feel better", but for some it's the opposite. My guts have completly healed from heavy issues after switching to 99% animal sourced diet(mostly fish, but also clean simple meat)