It isn't that any choices or conditions are necessarily bad, just that one needs to be aware and compensate for them if they cause problems. I really don't have a background in nutrition but for the past few years, I have been caring for my parents who are in their 90's so I have been trying to get a handle on the subject.
As far as being a vegan, one has to ask if you have been feeling healthy or have had prolonged periods of being unwell. If so, you might want to consider modifying your diet to become more ketogenic in nature. As a starting point, I recommend Dr. Eric Berg to gain a background to what I am suggesting. He promotes both Keto and intermittent fasting (more than 16 hours of not eating per day). You might also want to check out Dr. Boz a medical doctor who comes at it from a little more clinical perspective.
I don't want to dissuade you from veganism, but from a nutritional standpoint, I don't know enough to become vegan. One way that your ancestry comes into play has to do with how you evolved to eat certain foods. As an example, people from Ireland used to have a high concentration of potatoes in their diet.
While Polynesians used to eat Poi (taro root).
The first nutrient that you should look at is Potassium. The daily requirement of potassium is 4700 mg. An adult Irishman would need to eat 3 large potatoes to meet this particular requirement. A Polynesian would net to eat around 10 cups of Poi to achieve the same level.
Both Irish and Polynesians ate pork.
As you can see a two serving of roast pork provided almost the daily requirements for potassium.
Getting back to Vitamin D which is something freely available just by spending enough time in the sun, there is almost 3 percent of Canadians with a sufficient deficiency enough to cause rickets.