I launched a web recently. Should I focus on optimizs UX or adding new functionalities?

Hey there! I created a website which is driving some traffic, so I can analyze the user behaviour. Right now, my bounce rate is really low, visits are growing weekly and it seems like it's performing well. So I'm not sure how to proceed. I think that the general user experience is far from perfect. Should I work more on it? Or should I add more functionalities that may be valuable for users? As I have a low bounce rate and good interaction, I feel that I should add more things. But I'm not sure what will happen if I experience a sudden burst on traffic. What are your thoughts? I really appreciate your feedback