Haha, this is great. I've done the thought experiment of something like: What would you do if you received a million dollars? But not with crypto!
Step 1: Choosing A Goal: How to Best use 100k STEEM
I think most people, including myself, would be tempted to convert some of that 100k STEEM into USD, or another crypto. I would do my best to refrain from this. I would probably take several days to come up with various ideas for what my goal is for its use -- I would also ask questions like this on apps like Musing :P
One vague goal (that I would spend about a week fleshing out) would be to act as an investor for a current STEEM dApp I believe in - or - create one of my own.
Step 2: Converting 10k to Steem Power
A significant amount, let's say 10k, would be converted into Steem Power for use in upvoting with dApps like Steemit. This would allow me to increase the value of my presence beyond just creating content - and help other people people who I think create amazing content.
Step 3: Survey the STEEM dApp Market
I would spend time reading about existing dApps (and those in development) to see if I could work out an investment deal.
Step 4: Invest ~20k in a Current STEEM dApp I believe in
20k is just an imaginary number, the actual amount would depend on too many factors to list here. This would be in exchange for having an input on the product's direction and some form of equity deal (probably in STEEM.)
Step 5: Spend ~20k on creating my own STEEM dApp
Again, 20k is super arbitrary. Right now I have an idea for a dApp which is essentially what the "video response" feature (now banished by Google) allowed us to do on YouTube. Simply make a video expressing an opinion/statement on an issue - or - asking a question. Then allow for threaded video responses solely for addressing the original video. The primary purpose would be to engage in conversation via video only and build a community that way. No written responses allowed, and no original content that doesn't fit that model (like a let's play style video) allowed.
Step 6: Save the remaining 50k STEEM
Maybe the dApp I invest in fails. Maybe the dApp I create fails. I'd want to keep some skin in the game in case I discover I'm not really good at investing in/creating STEEM products.
That's it!
This was fun. I'm looking forward to reading what others write!