I'm huge on systems. I love building them and tweaking them, and plan to be in your position 24 months from now, if not next year. Here's where I see simple solutions to scale up:
Great contractors - find them and make them love you. Give them parameters and preferences, grow in trust and make them as autonomous as possible.
Deal network - whatever kind of deals you want, there are people who will see them first. Pay them, make them love you too, and be their go-to investor. Either help them out-grow you, or grow with you. Now deals come to you.
Money network - report all successes in grand style to those who you may want to borrow from in the future. Build the reputation of Midas.
Awesome broker - You'll lose whatever % you negotiate, but they can free up massive amounts of time, do staging if you want, and sell faster than you can (potentially) with their network. Just give them good houses at fair prices, fire-and-forget.
All of this will cost you money, but I expect you will make much more in volume. If you have these elements then your business is now: weekly status reports from contractors + periodic inspections, daily review of deals from your network, and reporting success to networks. You go to a deal, check the numbers, and green-light it or don't.
Added to these I would take on an assistant that wants to learn the business, and get them to view properties and run numbers, run errands, and generally make life easier on you. Maybe even do signings to close so you're not running all over and waiting on those. Later they graduate to wholesaling to you?
I wrote all this as an exercise for myself, but I hope it's a high-view help to you. I plan to build my business up through relationships, because people are the key in every market.