Hello, been lurking around for a while and recently got a question I need a little help with

So, past few weeks I was learning Reaktor and now I feel fairly comfortable with it on pretty basic level. I am not a musician, but sound designer.
I made my own little happy grainCloud syntesizer with XY controller and stuff, because I didn't like overcomplicated factory ones (they also are harder to tweak since their structure goes beyond my abilities to understand).
Anyways, I ended up with very few things I use in Reaktor for sound design: grainCloud, filters, reverb and stereo panorama (because I feel here I have more control over the onces I have in Cubase (yes, I use Cubase for layering and some audio manipulation)).
I wanted to ask you guys for some ideas about what else can I do with Reaktor for sound design? My progression/learning kinda stuck because of lack of clear goal :/

I also was thinking about starting max/msp, but again I am not sure about what will I build with it besides granular synthesizer (if so it will not worth the effort obviously).

Thanks!

If you don't have a project in need of music, the obvious avenue for "sound design" is making novel and specialized synthesizers (and maybe effects), both for you as a learning exercise and for others to use.
For example, you could use frequency modulation to produce nicely inharmonic bell sounds, put some exotic oscillators, filters and modulation sources in a traditional VA structure, explore simple but nonlinear effects, apply granular resynthesis to a specific use, and so on.