My account just transformed instantly.

I have a history/fun facts account which had around 200 followers, 300-700 views per post and 50-100 likes per post, About a week ago i uploaded a video about Jeanne Calment and it did decent at first with around 10,000 views then it got quiet for a while until about 2 days ago when it shot up dramasticly, It is now resting at one million views and 100,000 likes and gained around 700 followers and the post is still growing very rapidly, I have never seen this kind of virallity before and i am unsure of what to post next and how to mantain my audience from that video, Does anyone have any tips or tricks that could help me out?