(edit: translation fixed)
This year there are many ideas for #SGAM2018 and I really like this!
Then I would suggest another one:
The More & Less Challenge:
Play two solo adventures, the first using more tools (rules, pdfs, dice, cards, randomizers, sourcebooks etc.) than you’ve ever used, in the second adventure use less tools than you’ve ever used.
What do you think?
Lone Wolf Roleplaying 
I’m in your same situation, I think the tools category includes writing materials and, having already played bivius basic, for the “Less” part of the chalenge I should try playing without writing anything!
I believe that the basic idea of challenges is to try something new 🙂
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Evandro Novel I forgot about this: I did not mean the complexity of the rule system, but the number of tools to use, so for example Risus + Tiny Solitary Soldiers count for two tools while Ironsworn would count for one 🙂
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lino pang, oh, a good theater of the mind session! I’m also thinking that it’d be interesting to play using just a few keywords here and there, in some sort of controlled bullet point list. Maybe I may find there a new set of narrative dynamics to make my games go faster.
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