Curtain rails

So, I want to start basic training with my conure.
He's happy getting out of his cage, and explored a little bit (tables, shelves, even the floor) for the first few days.
Now he just flies straight to the curtain rails and stays put for hours on end, going back into his cage for food, and then flying back up there.

Is there any way to discourage him from going up there? We have a play stand on the table next to his cage, but he's shown little interest in it, even with treats placed there.

He isn't finger trained yet. Wasn't tame when we got him, but he happily accepts food from our hands and isn't scared when he's in his cage (he usually climbs over to the side you're on ), but when he's on that curtain rail he just edges away from you.

I've tried getting him to step up onto a small perch, but he only does it in his cage, and only on occasion. He just moves away if I try and get him to step up from the curtain rail.

I'm also worried that him just sitting there for 3 hours+ every day isn't exactly stimulating for him. Isn't the whole point of out-of-cage time that they... explore and mess around with things? He actually has more to do in his cage than he does up there.

It's hard to say about being stimulated enough. I've had my CAG's for a month now, and they never leave their cage top. They seem happy and slender, so I guess I shouldn't worry. I look forward to the other responces.

He probably enjoys the view and safety! You know, watching silly humans running about below, and maybe anything else that roams the floor! And heck, if he can see out the window, that might be even more entertaining!

What about restricting his access to the cage when he's out and only having food with you or on the stand? But making sure it's easy to access? And teach him to come to you on command. I know millet is usually a favorite, as are sunflower seeds.