I don't know much about video cleaning, but I do know you are going to get much better results starting from the raw footage versus using the already compressed YouTube footage. A little searching found this free enhancing tool. Movavi looks a little more promising in terms of capability.
It cracks me up when you come to Epic asking for help with your skiing. Most of us should be taking lessons from you (me included). The big thing to see in this clip is that your ski tips get a lot of air time in the last 1/2 of the run. This is going to happen as you crank up the speed and choose a line going over the tops. It's only a problem if you are out of control and want to slow down. Not a big deal here and actually a fun way to ski bumps if you can pull it off. A little thing is that your skis get out of parallel in spots. This too is something that happens as the speed cranks up. And for this run, it is mostly cosmetic. But one thing that struck me is that a couple of times we can see your new inside ski turning and tipping just like you were skiing a groomed run. This is slower than turning both skis together as a unit. There is a reason why mogul skis are still pretty straight. If you intended this, then never mind. If it's a habit, then having the option to turn both skis together (especially when one is airborne) is something to work on. It will make the runs look cleaner.
Thanks for sharing. Now get a $300 throw away real video camera so you can just give it to an oaf videographer and pray they can work the zoom to keep the skier 1/2 to 2/3 of the frame size. That way we can easily see how really good your skiing is and you won't have to waste time putting lipstick on pig video footage.