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I'm also a lefty (left handed, not political leaning)

Best answer, get into competitive shooting. Either IDPA or USPSA (IDPA is a little more newbie friendly, but USPSA has more complicated puzzles). You will find yourself shooting from awkward positions and even from inside a vehicle through both drivers and passengers windows. You will be able to practice things that you cannot practice at most ranges. I have shot out the driver's side window of a vehicle enough that it is just another shooting position.

Through competitive shooting I've shot from a recliner, a zero gravity chair, the toilet, a vehicle, a golf cart, from the trunk of a car, prone through a culvert, strong handed, weak handed, through ports that had to be held open, standing on an unstable platform, seated in an unstable canoe, handcuffed, even tied to a swinging pendulum. Started with hands under water, gun in a box, gun on a barrel (loaded and unloaded), gun in a tool box, gun in a center console, gun in a dresser drawer, gun and mags in a gym bag, mags in an apron pocket, etc.