Might I suggest adding an active player in the 2500 - 5000 range. They may not have replays on many tracks, but they should show up on that little bar at the top of the screen fairly frequently (unless you have 10 people on your list better than them).
Those who have offered their support above have great runs, but when I was ranked outside the top 10,000, there's no way I could have pulled off some of the things they were doing. It's still good to have people like that on your list though, because they cleanly pull off some of the simpler moves that will save you some time. That said, most platinum times are available without shortcuts, but you won't see those kinds of runs on any of their accounts.
I made a bunch of videos of the actual tracks as I was hitting platinums, and you can check out my channel
here if you'd like. You might have to scroll down through my videos or use the search in the upper right to find the track you need.
The reason I mentioned adding an active player in the 2500 - 5000 range was because they will also be improving their times, and will likely start getting more and more replays. It gives you new goals all the time.
Good luck!
