Hi dear doctors, i need advice on the daily/weekly/ monthly dosage of required vitamin d to take in a dark country to keep my vitamin d balanced?

Depends on diet: A dark country presumably means a time of year with little sunlight. Some people get plenty of dietary vitamin D (one can look up his dietary amounts, noting fortified vs. unfortified foods). For daily supplements, 400iu or 10mcg is recommended, but more if one started out deficient. See: https://sciencenordic.com/antidepressants-cancer-d-vitamin/new-study-were-not-getting-enough-vitamin-d/140960