In my opinion, youll get much better photos once your 70-200 comes. What others mentioned here with a blurred background is not only a control of your aperture but depth of field. Wider the focal length, the wider the depth of field is. This is why with your 50mm, the background lacked any reasonable blur at f1.8. To get more emphasis on the skier, the best thing to do will be to stand further back with the 70-200 and then zooming in further. 200mm at f2.8 will offer much more background blurr than a 50mm at f1.8. Photography like most works within the realm of ratios. Each time you zoom in at one aperture, your focus plane will shift drastically. As a landscape photographer, I spend a lot of my days fighting this ever present depth of field. This is why as a landscape photogapher, I stick to aperture such at f11 and f16 in order to get the overall image sharp and with wide angles, I delve into a bit of focus stacking with vertical shots...Horizontal shots usually dont, but obviously it depends on how close your foreground is. Hopefully with those other lenses, youll dive into some other aspects of photography like landscape. Theres more than plenty of opportunities for such in Washington.
From a compositional standpoint, try to maintain as much focus as possible on the skier. What can really help is removing messy backgrounds from the shooting point or find a background that is cohesively the same color overall with a different color on the skier. That will really help. Its a similar concept to wildlife photography as well, but with people, youre in more urbanized or developed environments and its really key to get that focus. I could see using a smaller aperture like f11 or f16 with a wide angle and pointing it up towards the skier. Just keep in mind that not only will you get more in focus with a smaller aperture, but a wider focal length will exacerbate that focal plane by A LOT!!