Hi onemanatatime

"So that made me switch to moderate fat. medium carb and protein"
Good plan. Among other things, in my day job I have taught dietitian students in their preclinical years.

"if you have the MTHFR gene, you simply wont methylate as a normal person"
Everybody has the MTHFR gene; it is mutations in it which are important. The most common of these are C677T and A1298C though there are others.

This is a good example of when genetic screening is sensible. People with mutations like C677T and/or A1298C in the MTHFR gene will have abnormalities of folate metabolism - this is when a folate supplement will be appropriate for specific medical/physiological reasons.

" have a very wide diet variety and A LOT of vegetables"
Good plan.

"i think it's very ignorant to say that a healthy diet will provide your body with what it needs [emphasis added]"

It is up to others to judge the extent to which I am "very ignorant". In my day job I teach University students and do biomedical reseach (PhD, not a medical qualification). I have a reasonable understanding of most of biomedical science though of course there are things that I don't know about.

As far as your diet is concerned I suggest that you see both a GP and a dietitian. The GP will be able to check you out for medical problems (with help from specialists if needed) and then, depending, confer with a dietitian about ways in which your diet could be improved in the context of (possible) medical problems.