If you haven't tried it before, one trick I always teach my students when it comes to tone practice is to bob their heads in the direction of the tones as they say them. The extra head movement helps remind them which way their voices are supposed to move. You can try this:
When saying 元、园、员, move your head from the lower left to the upper right corner.
When saying 远, start your head at the upper left corner and drop it down slowly toward the lower right before hooking it back up ever so slightly.
It may seem silly, but it can help. Once you've started to pronounce the tones more naturally, the head movements will gradually disappear =)