Though, think if you keep shooting with the Leica, do you think it would be possible to learn from your compositional mistakes and thus become a better photographer?
At the end of the day, the camera can still put a picture on film the same as any SLR can. If the vision is lacking, then perhaps that is a good place to concentrate on improving you photography ability.
It may be hard to admit, but 6 bad rolls has very little to do with the type of camera. Indeed using a RF, I take a different sort of picture as opposed to my 6x6, but I don't think they are of any less quality. Yet every now and then I shoot a couple of bad rolls and think what was going through my head, I think on that and learn and note what I may have done wrong.
RF's have only served in making me more aware of the photographic opportunities out there. Selling the kit is at your disadvantage as it seems as if you're purposely avoiding an area of your ability that needs to be addressed.
Perhaps sell, but do buy a cheap RF and stick at it mate,
and I mean this sincerely and to no offense.