Many if not all the responders are from USA, where bootfitters are sometimes willing to mess with your alignment. I've heard that this is not done usually in Europe. Technically, adjusting your alighment means the bootfitter will change the way the boot sole, at the outside bottom of the boot, is tilted. I think that's what I've heard European bootfitters won't do. Maybe it's an insurance issue. Or maybe I've heard wrong.
But there are other things that need to be looked at before doing permanent changes to the plastic bootsoles at the bottom of your boots. Let's talk about those.
--How snug are your boots, especially the left one? Do the walls of the boot cradle your foot snugly all around? The boot should be pressing against your foot 100% of the time in front of the toes, all around the heel and ankle, along both sides of your foot at its bottom, and the boot should even be pressing down on the top of your foot. It should be a nice, tight fit. Does the cuff hug your lower leg all the way around it, from the bottom at the ankle all the way up to the top of the boot? It should. The boots need to be good and snug and firmly hugging your foot in all theses places or you might need new boots a size or two smaller.
Boots can always be made larger by your bootfitter. He/she can grind out a hollow area in the plastic where your foot is uncomfortably cramped. But too-big boots can't effectively be made smaller. A good fit is the first thing you need to get. Everything else comes after.
--If the boots fit, do you have custom footbeds inside your boots? If not, that might help. Your bootfitter will need to check the mechanics of your feet before making the footbeds; then he/she will make the footbeds to support your foot accordingly.
--If the boots fit, have you had the cuffs adjusted to align with your shins? Most boots offer a slight amount of side-to-side adjustment so that the cuffs are tilted at the same angle as your lower leg. This can make a big difference.
Good luck with your boot issues. This is the most important part of your gear. Getting them fixed comes first before messing with skis or even lessons. Poorly fitted boots will derail the best skis and the most informative lessons. Good boots that meet your anatomy's needs are pure delight, but difficult to come by. Keep messing with the boots until they are right.