I'd like to know if there is something I can do to close the gap or hide the gap in the blinds. Obviously, I can measure properly and purchase new ones but really trying to avoid that.
I've also thought about curtains, but it's also something I'd like to avoid. Are there any solutions to this?
Here is another photo zoomed out. 
curtains are the solution even if you are trying to avoid it. curtains help soften the corners of the windows, too.
Or two more large plants and center them around the gap.
I have a "center curtain" for this very reason. Depends on how much it hurts your soul to basically turn one window into two smaller windows.