There are curtain rods that are spring-loaded and stay up with tension, sort of like a shower curtain rod doesBuy those, and hang curtains on the inside of the window frame.
Curtain rods are literally not put in on the windowthey are put in on the wall, frequently a minimum of two faraway from the bodyit truly is way extra common to patch a hollow in a wall than to patch a hollow in a window body.
use a stapler that opens up so you can staple them directly to the wall above the window, staples don't leave big holes to damage the wall, and they come out easily enough with the curtain when you pull them outStaple in an X and they will stay upI have done this for yearsI have an old stapler that opens up, and I have to kind of bap it hard to get them to go in, but it works very well.
Find some light curtains, or sheer fabric that you like and will let light come throughThen remove the plastic plates that hold the blinds inPull out the blinds and drape the top of the fabric over the top, then slide the blinds back in so that the fabric is held in place by the blindsThe material needs to be thin in order to do this, and you may have to work with it to make it look nice, but it will allow a bit more privacy with the blinds and cut down on the lightJust don't drape the fabic too far over so that it looks bad from the outside.
a long necked marsh-dwelling bird a machine that lifts things a british rock band a freight-train sort of car associated with railroads and transportation depends on the context