how to draw a smooth line connecting all points

tidyverse
,
3 
ggplot(DT, aes(xx, yy)) + 
  geom_point() + 
  scale_x_continuous(breaks = seq(2013, 2023, by = 1)) + 
  geom_xspline(color = "#0003f3", linewidth = 20)

I have used the breaks in scale_x_continuous in order to get proper x asix.
there are two problems

  1. geom_xspline does not accept linewidth and if i change to size argument, it is not working
  2. how to shade the area under the line

I am wondering if there a way to function i could pass xx and and yy and it will calculate the spline.