It depends on a lot of factors, like what boho means to you and what your budget is. You could change the light fixtures or bedding, repaint the walls, or even just add a throw pillow that suits the theme.
Macrame!! Check out the one I made over here: https://happydealhappyday.com/thrift-store-makeover-diy-wall-decor/
I found a tutorial on Youtube on how to make it.
here are some easy idea: