I’ve been trying various things from yogurt, sauerkraut, kimchi and supplements and I haven’t really had success. I must be doing something wrong or too much or not enough idk.

Yes, you're doing something wrong. Wherever you're getting your health/microbiome advice from is a poor source. You can find better info here: https://humanmicrobiome.info/faq/

Fermented foods contain non-host-native microbes. Their benefits are hugely oversold. They will not restore your gut microbiome.

Gastroenterology and nutritional science is complicated, yo. Who knows what could be causing it. Unfortunately getting the tests to figure it out is timely and, for some, prohibitively expensive.

Not that simple. They love carbs. Yet, not just any simple carb like starches or sugars but a specific, complex carbohydrate: cellulose, i.e. fiber, which they break down into sugars that our body can use.

So only brown rice, whole wheat bread, and the skin of potatoes. Potatoes are actually bad for your gut because they are so high in starches.

Otherwise, they love nuts and greens. Ya know, other foods that are high in fiber content.