Ask HN: What to do when your side-project takes off?

Very curious to know how things change when you have hyper growth. How do you deal with priorities? Do you reach out to get seed-funding? Who do you speak to? Do you sell?

I am asking because I read a lot of stories of people getting #1 on HN or PH and suddenly their servers are down because of heavy traffic. What do you do after that? It seems super crazy