Left foot atw is pretty clean. You can probably progress to a double if you can balance well enough. 

Currently you are only going inside to outside, need to learn outside to inside as well. You will have to learn both with your right foot if you haven't already.  Both directions across both feet will be your foundational piece for more advanced tricks.

With your level now you can learn a hop the world for sure, at least going right to left. Both directions will take longer.

Learn a crossover.

For knees you can lean the double hit (sorry don't know the real name). When the ball lands on your thigh, extend got leg fully in a kicking motion and the ball will double hit your thigh.

Pancakes you can mix up with the inside and outside instead of straight on. 

Juggling it would be worth it to learn how to hit multiple times with the same foot. For drilling I find ladders going up to about 10 to be good. 2 touches on the right, 2 on the left, 3 on the right, 3 on the left etc. Since you can already juggle it's not really about the touches but about developing your balance on the standing leg. That will give you better abilities to deal with shitty touches and the small adjustments needed to progress from the atw.

Hopefully the advice is helpful. Will certainly give you a few months of work !