I must not have these bug because my gut always sore

Same.

I’m almost positive that decades of poverty meals with almost zero nutritional value has decimated my gut microbiome.

See at least you have a seemingly potential reason. Also, I think if that’s what the cause is, you might have luck with taking prebiotics and probiotics to help garner it back.

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.

Gastroenterology 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.