What "scale it up" really means, is that you have to take yourself out of the processes that actually generate cash as much as possible, so that you can spend your time setting up more processes.
In the case of a review website, this is relatively simple. You create a website, get traffic flowing, collect money, create new website in new niche while old one cranks out cash (some of that cash might be spent on traffic methods, so that you don't have to keep doing it yourself).
In the case of fiverr gigs, you have to be selling something people want that will take *you* a reasonable amount of time to process compared to your income goals. If it takes you 20 minutes to deliver the gig, then you can make $12/hr. If you spend 2 minutes processing an order, and hire someone to do the work for $3, you can make $30/hr. If you pay someone .25/order to process the gigs, and hire the work out for $3, your earning potential limited only by # of orders, and the amount of people you can find to do the work. You just have to find w/e happy medium works for the product or service you're selling.
Freelancing, you can only make what you charge, unless again you're hiring the work out.
My main income right now is selling SEO and website design to local businesses, and while I *could* do the work myself, instead I outsource the work and spend my time finding new clients, looking for an income source I would prefer doing, and developing my coding skills. I hate going out and trying to sell to business owners, but right now it's what I'm good at it, and it pays the bills.