Hi @Allen Brouwer,
Great to see you on here again. I'd like to play the game: If I had a $100K. : )
If I had $100K I would research local multi family properties and financing options. I would try to buy 2-3 multi family properties with as little down into each one (if possible - it depends on the purchase prices.) I'd make sure that each property cash flows positive with a cash on cash return at the minimum at 10% (the higher the better of course).
Then I'd leverage the rest of the cash left over and use that to secure a flip.
I'd suggest checking out Patch of Land as they have a innovative crowd funding platform and they evaluate each deal to ensure they believe it will be successful (another set of checks and balances especially for a new flipper). Then as long as you and your project is approved your request is funded. If Patch of Land isn't your thing, perhaps you can partner with someone on the 1st flip. You bring cash, they bring cash and you spend your time managing the flip and learning the ins and outs of it so you can replicate in the future.
I believe this strategy is the best of leveraging other people's money to increase your returns as well as having your eggs in more than 1 basket.
(On the other hand, I would never use $100K to pay down a bank loan. If you were to do this, you'd be turning the control of your money over to the bank. Which of course means you'd need to rely on them to approve you to borrow it back. Plus, they likely would only let you borrow back 80%-90% CLTV (combined loan to value) which means you probably won't be able to borrow back the $100K.)
Hope this helps! : )