A good example for why one should be able to exit from the RIGHT side of a tractor! (I've seen manufacturers leave off steps on that side thinking that it's safer, to discourage people from entering and exiting from the right.)
Needs to pull more from the right. Probably pulling at 45 degrees off the right corner of the bucket, with the implement disconnected, ought to allow the tractor to touch down on it's front right tire and get traction. Been in a similar situation wherein it only took bringing down one front wheel on to hard ground was sufficient to then allow the tractor (in 4wd) to crawl out: used a cable and cable puller off of a tree- took only a few clicks to tip the tractor on to the viable wheel (others were in mud and water).