If you're standing on your skis a bit better than you were in your original video, you might consider this:
Get a job.
In particular, a starting ski instructor job. Find out what the resort has for beginning training/hiring clinics, and go. Find out their rules and jump through the hoops to get hired.
It won't be easy. It will require commitment and discipline. If you get hired, you'll have to teach beginners. You might have to teach kids. You'll have to think of skiing as a job, at least when you're working. You have to reliable. You have to smile a lot and communicate reasoably well. It will pay very little.
The benefits are numerous. First, you get unlimited clinics with the area's best trainers. For free. You will get unlimited critcism, too, so you will have to develop a thick skin.
You will ski with people who are often not self-proclaimed "experts" but who have been trained and tested and critiqued and examined again. If they're good, they'll be able to tell you the issues with their own skiing that they're working on. They will ski better than you, and they'll know how to help you improve your skiing.
You will learn to truly know your own skiing. You will have to learn to show and articulate the fundamentals that allow your skiing to develop and allow your students' skiing to develop without any dead-ends. You'll learn that intitiating a turn is not about "avoiding the stem." Simply trying not to do somethng doesn't work. You'll learn (if you haven't already) that initiating a turn requires releasing down the hill and allowing gravity to help.
You will be required to show up. No excuses. It's a job. It changes your priorities. The number of days you spend on skis will go up, and the number of hours you spend doing seemingly basic drills will go up, too. You will get better.
Now, you might think this will take the fun out of skiing. Some days, it will. You can have difficult students, days that are too busy, supervisors that make you wonder how they got the job.
But most days, you're being paid (a little, anyway) to ski, to learn (from your students, too!), and show other people how to have fun. It'll be fun for you, too. And rewarding. It's a wonderful experience when the overweight housewife who announced at the start of the lesson that she's only there because her husband dragged her comes motoring down the bunny run, turning both ways, controlling her speed, and giggling. If I can do it, most other people can, too. After all, I'm an engineer - a technical type with borderline communications skills.
As has already been stated in this thread, learning to ski well requires discipline. Working with the requirements of being an instructor, working with guests, working toward certification, will also require discipline.
If it's a good ski school, it will serve as a support group to help you with that discipline and give you the tools you need to radically improve your skiing.
One more benefit: As your skills improve, you will actually impose less stress on your body and reduce the probability of injury. For example, bump skiing does not have to be hard on the knees and it doesn't require impact. Accurate stance and movement requires less muscle and less pull on your tendons and ligaments, less strain on your joints. You can reduce the release settings on your bindings and still not pre-release. Etc., etc.
And, as your skills improve, the fun you have free skiing will go up. Way up.
So, think about trying it. It won't be the easiest thing you've ever done. It could be one of the best things you've ever done.