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. 
I mean, how much work do you feel like doing? If I were in your shoes the nicest way to make those two blinds in that position work I think would be to extend the individual slats. Easiest would be cutting paperboard down to size and taping it on, but I’d 3d print pieces that clip on and match the blind color to make them less noticeable.