Welcome to the world of podiatrists, everyone has a viewpoint on pronation and there isn't a lot of consensus / knowledge wrt to feet in hockey skates. At least you recognise that orthotics aren't the only answer so that weeds out 99% of the bs artists that want to sell you an orthotic so they can make money from it. There are NHL players that pronate and skate really heavily on their inside edges, pronation isn't the only limiting factor to you becoming a good player. And your dad is right, there is no miracle or quick fix, orthotics, shims, wedges, holder movement are just band aids on the problem. All of the research that I have been / still am involved in consistently proves that there is a long term viable solution to fixing pronation in skates, learn to skate laces untied / lace free. Yes, you take a hit in your development over the next year or so as you learn the base skills to do it and then over the next year as your body learns to control the skates at high speed and then even another year as you learn to refine all that has come before to a consistent high level but... at the end of that time you will not pronate in skates, ever again. Period. You said you "wanted to keep on working harder" then this is what you have to do, it WILL fix your pronation and at the end of the process you will have the skill base to be the best skater you can possibly be.